1119 lines
21 KiB
C
1119 lines
21 KiB
C
/*
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* Copyright (C) 1984-2023 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Routines to mess around with filenames (and files).
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* Much of this is very OS dependent.
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*/
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#include "less.h"
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#include "lglob.h"
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#if MSDOS_COMPILER
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#include <dos.h>
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#if MSDOS_COMPILER==WIN32C && !defined(_MSC_VER)
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#include <dir.h>
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#endif
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#if MSDOS_COMPILER==DJGPPC
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#include <glob.h>
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#include <dir.h>
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#define _MAX_PATH PATH_MAX
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#endif
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#endif
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#ifdef _OSK
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#include <rbf.h>
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#ifndef _OSK_MWC32
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#include <modes.h>
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#endif
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#endif
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#if HAVE_STAT
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#include <sys/stat.h>
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#ifndef S_ISDIR
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#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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#endif
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#ifndef S_ISREG
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#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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#endif
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#endif
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extern int force_open;
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extern int secure;
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extern int use_lessopen;
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extern int ctldisp;
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extern int utf_mode;
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extern IFILE curr_ifile;
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extern IFILE old_ifile;
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#if SPACES_IN_FILENAMES
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extern char openquote;
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extern char closequote;
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#endif
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#if HAVE_STAT_INO
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extern ino_t curr_ino;
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extern dev_t curr_dev;
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#endif
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/*
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* Remove quotes around a filename.
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*/
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public char * shell_unquote(char *str)
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{
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char *name;
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char *p;
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name = p = (char *) ecalloc(strlen(str)+1, sizeof(char));
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if (*str == openquote)
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{
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str++;
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while (*str != '\0')
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{
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if (*str == closequote)
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{
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if (str[1] != closequote)
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break;
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str++;
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}
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*p++ = *str++;
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}
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} else
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{
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char *esc = get_meta_escape();
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int esclen = (int) strlen(esc);
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while (*str != '\0')
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{
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if (esclen > 0 && strncmp(str, esc, esclen) == 0)
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str += esclen;
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*p++ = *str++;
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}
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}
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*p = '\0';
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return (name);
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}
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/*
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* Get the shell's escape character.
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*/
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public char * get_meta_escape(void)
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{
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char *s;
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s = lgetenv("LESSMETAESCAPE");
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if (s == NULL)
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s = DEF_METAESCAPE;
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return (s);
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}
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/*
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* Get the characters which the shell considers to be "metacharacters".
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*/
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static char * metachars(void)
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{
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static char *mchars = NULL;
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if (mchars == NULL)
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{
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mchars = lgetenv("LESSMETACHARS");
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if (mchars == NULL)
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mchars = DEF_METACHARS;
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}
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return (mchars);
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}
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/*
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* Is this a shell metacharacter?
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*/
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static int metachar(char c)
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{
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return (strchr(metachars(), c) != NULL);
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}
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/*
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* Insert a backslash before each metacharacter in a string.
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*/
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public char * shell_quote(char *s)
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{
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char *p;
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char *newstr;
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int len;
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char *esc = get_meta_escape();
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int esclen = (int) strlen(esc);
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int use_quotes = 0;
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int have_quotes = 0;
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/*
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* Determine how big a string we need to allocate.
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*/
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len = 1; /* Trailing null byte */
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for (p = s; *p != '\0'; p++)
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{
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len++;
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if (*p == openquote || *p == closequote)
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have_quotes = 1;
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if (metachar(*p))
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{
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if (esclen == 0)
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{
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/*
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* We've got a metachar, but this shell
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* doesn't support escape chars. Use quotes.
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*/
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use_quotes = 1;
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} else
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{
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/*
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* Allow space for the escape char.
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*/
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len += esclen;
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}
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}
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}
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if (use_quotes)
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{
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if (have_quotes)
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/*
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* We can't quote a string that contains quotes.
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*/
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return (NULL);
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len = (int) strlen(s) + 3;
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}
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/*
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* Allocate and construct the new string.
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*/
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newstr = p = (char *) ecalloc(len, sizeof(char));
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if (use_quotes)
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{
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SNPRINTF3(newstr, len, "%c%s%c", openquote, s, closequote);
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} else
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{
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while (*s != '\0')
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{
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if (metachar(*s))
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{
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/*
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* Add the escape char.
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*/
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strcpy(p, esc);
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p += esclen;
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}
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*p++ = *s++;
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}
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*p = '\0';
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}
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return (newstr);
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}
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/*
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* Return a pathname that points to a specified file in a specified directory.
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* Return NULL if the file does not exist in the directory.
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*/
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public char * dirfile(char *dirname, char *filename, int must_exist)
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{
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char *pathname;
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int len;
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int f;
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if (dirname == NULL || *dirname == '\0')
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return (NULL);
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/*
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* Construct the full pathname.
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*/
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len = (int) (strlen(dirname) + strlen(filename) + 2);
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pathname = (char *) calloc(len, sizeof(char));
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if (pathname == NULL)
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return (NULL);
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SNPRINTF3(pathname, len, "%s%s%s", dirname, PATHNAME_SEP, filename);
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if (must_exist)
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{
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/*
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* Make sure the file exists.
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*/
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f = open(pathname, OPEN_READ);
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if (f < 0)
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{
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free(pathname);
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pathname = NULL;
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} else
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{
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close(f);
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}
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}
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return (pathname);
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}
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/*
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* Return the full pathname of the given file in the "home directory".
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*/
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public char * homefile(char *filename)
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{
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char *pathname;
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/* Try $HOME/filename. */
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pathname = dirfile(lgetenv("HOME"), filename, 1);
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if (pathname != NULL)
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return (pathname);
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#if OS2
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/* Try $INIT/filename. */
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pathname = dirfile(lgetenv("INIT"), filename, 1);
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if (pathname != NULL)
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return (pathname);
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#endif
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#if MSDOS_COMPILER || OS2
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/* Look for the file anywhere on search path. */
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pathname = (char *) ecalloc(_MAX_PATH, sizeof(char));
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#if MSDOS_COMPILER==DJGPPC
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{
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char *res = searchpath(filename);
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if (res == 0)
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*pathname = '\0';
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else
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strcpy(pathname, res);
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}
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#else
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_searchenv(filename, "PATH", pathname);
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#endif
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if (*pathname != '\0')
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return (pathname);
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free(pathname);
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#endif
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return (NULL);
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}
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/*
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* Expand a string, substituting any "%" with the current filename,
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* and any "#" with the previous filename.
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* But a string of N "%"s is just replaced with N-1 "%"s.
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* Likewise for a string of N "#"s.
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* {{ This is a lot of work just to support % and #. }}
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*/
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public char * fexpand(char *s)
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{
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char *fr, *to;
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int n;
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char *e;
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IFILE ifile;
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#define fchar_ifile(c) \
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((c) == '%' ? curr_ifile : \
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(c) == '#' ? old_ifile : NULL_IFILE)
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/*
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* Make one pass to see how big a buffer we
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* need to allocate for the expanded string.
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*/
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n = 0;
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for (fr = s; *fr != '\0'; fr++)
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{
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switch (*fr)
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{
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case '%':
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case '#':
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if (fr > s && fr[-1] == *fr)
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{
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/*
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* Second (or later) char in a string
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* of identical chars. Treat as normal.
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*/
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n++;
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} else if (fr[1] != *fr)
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{
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/*
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* Single char (not repeated). Treat specially.
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*/
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ifile = fchar_ifile(*fr);
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if (ifile == NULL_IFILE)
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n++;
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else
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n += (int) strlen(get_filename(ifile));
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}
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/*
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* Else it is the first char in a string of
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* identical chars. Just discard it.
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*/
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break;
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default:
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n++;
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break;
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}
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}
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e = (char *) ecalloc(n+1, sizeof(char));
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/*
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* Now copy the string, expanding any "%" or "#".
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*/
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to = e;
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for (fr = s; *fr != '\0'; fr++)
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{
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switch (*fr)
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{
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case '%':
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case '#':
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if (fr > s && fr[-1] == *fr)
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{
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*to++ = *fr;
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} else if (fr[1] != *fr)
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{
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ifile = fchar_ifile(*fr);
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if (ifile == NULL_IFILE)
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*to++ = *fr;
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else
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{
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strcpy(to, get_filename(ifile));
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to += strlen(to);
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}
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}
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break;
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default:
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*to++ = *fr;
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break;
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}
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}
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*to = '\0';
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return (e);
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}
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#if TAB_COMPLETE_FILENAME
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/*
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* Return a blank-separated list of filenames which "complete"
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* the given string.
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*/
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public char * fcomplete(char *s)
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{
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char *fpat;
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char *qs;
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if (secure)
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return (NULL);
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/*
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* Complete the filename "s" by globbing "s*".
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*/
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#if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC)
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/*
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* But in DOS, we have to glob "s*.*".
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* But if the final component of the filename already has
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* a dot in it, just do "s*".
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* (Thus, "FILE" is globbed as "FILE*.*",
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* but "FILE.A" is globbed as "FILE.A*").
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*/
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{
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char *slash;
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int len;
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for (slash = s+strlen(s)-1; slash > s; slash--)
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if (*slash == *PATHNAME_SEP || *slash == '/')
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break;
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len = (int) strlen(s) + 4;
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fpat = (char *) ecalloc(len, sizeof(char));
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if (strchr(slash, '.') == NULL)
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SNPRINTF1(fpat, len, "%s*.*", s);
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else
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SNPRINTF1(fpat, len, "%s*", s);
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}
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#else
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{
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int len = (int) strlen(s) + 2;
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fpat = (char *) ecalloc(len, sizeof(char));
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SNPRINTF1(fpat, len, "%s*", s);
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}
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#endif
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qs = lglob(fpat);
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s = shell_unquote(qs);
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if (strcmp(s,fpat) == 0)
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{
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/*
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* The filename didn't expand.
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*/
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free(qs);
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qs = NULL;
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}
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free(s);
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free(fpat);
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return (qs);
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}
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#endif
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/*
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* Try to determine if a file is "binary".
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* This is just a guess, and we need not try too hard to make it accurate.
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*/
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public int bin_file(int f)
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{
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int n;
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int bin_count = 0;
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char data[256];
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char* p;
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char* edata;
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if (!seekable(f))
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return (0);
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if (lseek(f, (off_t)0, SEEK_SET) == BAD_LSEEK)
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return (0);
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n = read(f, data, sizeof(data));
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if (n <= 0)
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return (0);
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edata = &data[n];
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for (p = data; p < edata; )
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{
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if (utf_mode && !is_utf8_well_formed(p, edata-p))
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{
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bin_count++;
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utf_skip_to_lead(&p, edata);
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} else
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{
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LWCHAR c = step_char(&p, +1, edata);
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struct ansi_state *pansi;
|
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if (ctldisp == OPT_ONPLUS && (pansi = ansi_start(c)) != NULL)
|
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{
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skip_ansi(pansi, &p, edata);
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ansi_done(pansi);
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} else if (binary_char(c))
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bin_count++;
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}
|
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}
|
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/*
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* Call it a binary file if there are more than 5 binary characters
|
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* in the first 256 bytes of the file.
|
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*/
|
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return (bin_count > 5);
|
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}
|
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|
|
/*
|
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* Try to determine the size of a file by seeking to the end.
|
|
*/
|
|
static POSITION seek_filesize(int f)
|
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{
|
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off_t spos;
|
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|
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spos = lseek(f, (off_t)0, SEEK_END);
|
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if (spos == BAD_LSEEK)
|
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return (NULL_POSITION);
|
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return ((POSITION) spos);
|
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}
|
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|
|
#if HAVE_POPEN
|
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/*
|
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* Read a string from a file.
|
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* Return a pointer to the string in memory.
|
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*/
|
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static char * readfd(FILE *fd)
|
|
{
|
|
int len;
|
|
int ch;
|
|
char *buf;
|
|
char *p;
|
|
|
|
/*
|
|
* Make a guess about how many chars in the string
|
|
* and allocate a buffer to hold it.
|
|
*/
|
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len = 100;
|
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buf = (char *) ecalloc(len, sizeof(char));
|
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for (p = buf; ; p++)
|
|
{
|
|
if ((ch = getc(fd)) == '\n' || ch == EOF)
|
|
break;
|
|
if (p - buf >= len-1)
|
|
{
|
|
/*
|
|
* The string is too big to fit in the buffer we have.
|
|
* Allocate a new buffer, twice as big.
|
|
*/
|
|
len *= 2;
|
|
*p = '\0';
|
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p = (char *) ecalloc(len, sizeof(char));
|
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strcpy(p, buf);
|
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free(buf);
|
|
buf = p;
|
|
p = buf + strlen(buf);
|
|
}
|
|
*p = ch;
|
|
}
|
|
*p = '\0';
|
|
return (buf);
|
|
}
|
|
|
|
/*
|
|
* Execute a shell command.
|
|
* Return a pointer to a pipe connected to the shell command's standard output.
|
|
*/
|
|
static FILE * shellcmd(char *cmd)
|
|
{
|
|
FILE *fd;
|
|
|
|
#if HAVE_SHELL
|
|
char *shell;
|
|
|
|
shell = lgetenv("SHELL");
|
|
if (!isnullenv(shell))
|
|
{
|
|
char *scmd;
|
|
char *esccmd;
|
|
|
|
/*
|
|
* Read the output of <$SHELL -c cmd>.
|
|
* Escape any metacharacters in the command.
|
|
*/
|
|
esccmd = shell_quote(cmd);
|
|
if (esccmd == NULL)
|
|
{
|
|
fd = popen(cmd, "r");
|
|
} else
|
|
{
|
|
int len = (int) (strlen(shell) + strlen(esccmd) + 5);
|
|
scmd = (char *) ecalloc(len, sizeof(char));
|
|
SNPRINTF3(scmd, len, "%s %s %s", shell, shell_coption(), esccmd);
|
|
free(esccmd);
|
|
fd = popen(scmd, "r");
|
|
free(scmd);
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
fd = popen(cmd, "r");
|
|
}
|
|
/*
|
|
* Redirection in `popen' might have messed with the
|
|
* standard devices. Restore binary input mode.
|
|
*/
|
|
SET_BINARY(0);
|
|
return (fd);
|
|
}
|
|
|
|
#endif /* HAVE_POPEN */
|
|
|
|
|
|
/*
|
|
* Expand a filename, doing any system-specific metacharacter substitutions.
|
|
*/
|
|
public char * lglob(char *filename)
|
|
{
|
|
char *gfilename;
|
|
|
|
filename = fexpand(filename);
|
|
if (secure)
|
|
return (filename);
|
|
|
|
#ifdef DECL_GLOB_LIST
|
|
{
|
|
/*
|
|
* The globbing function returns a list of names.
|
|
*/
|
|
int length;
|
|
char *p;
|
|
char *qfilename;
|
|
DECL_GLOB_LIST(list)
|
|
|
|
GLOB_LIST(filename, list);
|
|
if (GLOB_LIST_FAILED(list))
|
|
{
|
|
return (filename);
|
|
}
|
|
length = 1; /* Room for trailing null byte */
|
|
for (SCAN_GLOB_LIST(list, p))
|
|
{
|
|
INIT_GLOB_LIST(list, p);
|
|
qfilename = shell_quote(p);
|
|
if (qfilename != NULL)
|
|
{
|
|
length += strlen(qfilename) + 1;
|
|
free(qfilename);
|
|
}
|
|
}
|
|
gfilename = (char *) ecalloc(length, sizeof(char));
|
|
for (SCAN_GLOB_LIST(list, p))
|
|
{
|
|
INIT_GLOB_LIST(list, p);
|
|
qfilename = shell_quote(p);
|
|
if (qfilename != NULL)
|
|
{
|
|
sprintf(gfilename + strlen(gfilename), "%s ", qfilename);
|
|
free(qfilename);
|
|
}
|
|
}
|
|
/*
|
|
* Overwrite the final trailing space with a null terminator.
|
|
*/
|
|
*--p = '\0';
|
|
GLOB_LIST_DONE(list);
|
|
}
|
|
#else
|
|
#ifdef DECL_GLOB_NAME
|
|
{
|
|
/*
|
|
* The globbing function returns a single name, and
|
|
* is called multiple times to walk thru all names.
|
|
*/
|
|
char *p;
|
|
int len;
|
|
int n;
|
|
char *pfilename;
|
|
char *qfilename;
|
|
DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle)
|
|
|
|
GLOB_FIRST_NAME(filename, &fnd, handle);
|
|
if (GLOB_FIRST_FAILED(handle))
|
|
{
|
|
return (filename);
|
|
}
|
|
|
|
_splitpath(filename, drive, dir, fname, ext);
|
|
len = 100;
|
|
gfilename = (char *) ecalloc(len, sizeof(char));
|
|
p = gfilename;
|
|
do {
|
|
n = (int) (strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1);
|
|
pfilename = (char *) ecalloc(n, sizeof(char));
|
|
SNPRINTF3(pfilename, n, "%s%s%s", drive, dir, fnd.GLOB_NAME);
|
|
qfilename = shell_quote(pfilename);
|
|
free(pfilename);
|
|
if (qfilename != NULL)
|
|
{
|
|
n = (int) strlen(qfilename);
|
|
while (p - gfilename + n + 2 >= len)
|
|
{
|
|
/*
|
|
* No room in current buffer.
|
|
* Allocate a bigger one.
|
|
*/
|
|
len *= 2;
|
|
*p = '\0';
|
|
p = (char *) ecalloc(len, sizeof(char));
|
|
strcpy(p, gfilename);
|
|
free(gfilename);
|
|
gfilename = p;
|
|
p = gfilename + strlen(gfilename);
|
|
}
|
|
strcpy(p, qfilename);
|
|
free(qfilename);
|
|
p += n;
|
|
*p++ = ' ';
|
|
}
|
|
} while (GLOB_NEXT_NAME(handle, &fnd) == 0);
|
|
|
|
/*
|
|
* Overwrite the final trailing space with a null terminator.
|
|
*/
|
|
*--p = '\0';
|
|
GLOB_NAME_DONE(handle);
|
|
}
|
|
#else
|
|
#if HAVE_POPEN
|
|
{
|
|
/*
|
|
* We get the shell to glob the filename for us by passing
|
|
* an "echo" command to the shell and reading its output.
|
|
*/
|
|
FILE *fd;
|
|
char *s;
|
|
char *lessecho;
|
|
char *cmd;
|
|
char *esc;
|
|
int len;
|
|
|
|
esc = get_meta_escape();
|
|
if (strlen(esc) == 0)
|
|
esc = "-";
|
|
esc = shell_quote(esc);
|
|
if (esc == NULL)
|
|
{
|
|
return (filename);
|
|
}
|
|
lessecho = lgetenv("LESSECHO");
|
|
if (isnullenv(lessecho))
|
|
lessecho = "lessecho";
|
|
/*
|
|
* Invoke lessecho, and read its output (a globbed list of filenames).
|
|
*/
|
|
len = (int) (strlen(lessecho) + strlen(filename) + (7*strlen(metachars())) + 24);
|
|
cmd = (char *) ecalloc(len, sizeof(char));
|
|
SNPRINTF4(cmd, len, "%s -p0x%x -d0x%x -e%s ", lessecho,
|
|
(unsigned char) openquote, (unsigned char) closequote, esc);
|
|
free(esc);
|
|
for (s = metachars(); *s != '\0'; s++)
|
|
sprintf(cmd + strlen(cmd), "-n0x%x ", (unsigned char) *s);
|
|
sprintf(cmd + strlen(cmd), "-- %s", filename);
|
|
fd = shellcmd(cmd);
|
|
free(cmd);
|
|
if (fd == NULL)
|
|
{
|
|
/*
|
|
* Cannot create the pipe.
|
|
* Just return the original (fexpanded) filename.
|
|
*/
|
|
return (filename);
|
|
}
|
|
gfilename = readfd(fd);
|
|
pclose(fd);
|
|
if (*gfilename == '\0')
|
|
{
|
|
free(gfilename);
|
|
return (filename);
|
|
}
|
|
}
|
|
#else
|
|
/*
|
|
* No globbing functions at all. Just use the fexpanded filename.
|
|
*/
|
|
gfilename = save(filename);
|
|
#endif
|
|
#endif
|
|
#endif
|
|
free(filename);
|
|
return (gfilename);
|
|
}
|
|
|
|
/*
|
|
* Does path not represent something in the file system?
|
|
*/
|
|
public int is_fake_pathname(char *path)
|
|
{
|
|
return (strcmp(path, "-") == 0 ||
|
|
strcmp(path, FAKE_HELPFILE) == 0 || strcmp(path, FAKE_EMPTYFILE) == 0);
|
|
}
|
|
|
|
/*
|
|
* Return canonical pathname.
|
|
*/
|
|
public char * lrealpath(char *path)
|
|
{
|
|
if (!is_fake_pathname(path))
|
|
{
|
|
#if HAVE_REALPATH
|
|
char rpath[PATH_MAX];
|
|
if (realpath(path, rpath) != NULL)
|
|
return (save(rpath));
|
|
#endif
|
|
}
|
|
return (save(path));
|
|
}
|
|
|
|
#if HAVE_POPEN
|
|
/*
|
|
* Return number of %s escapes in a string.
|
|
* Return a large number if there are any other % escapes besides %s.
|
|
*/
|
|
static int num_pct_s(char *lessopen)
|
|
{
|
|
int num = 0;
|
|
|
|
while (*lessopen != '\0')
|
|
{
|
|
if (*lessopen == '%')
|
|
{
|
|
if (lessopen[1] == '%')
|
|
++lessopen;
|
|
else if (lessopen[1] == 's')
|
|
++num;
|
|
else
|
|
return (999);
|
|
}
|
|
++lessopen;
|
|
}
|
|
return (num);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* See if we should open a "replacement file"
|
|
* instead of the file we're about to open.
|
|
*/
|
|
public char * open_altfile(char *filename, int *pf, void **pfd)
|
|
{
|
|
#if !HAVE_POPEN
|
|
return (NULL);
|
|
#else
|
|
char *lessopen;
|
|
char *qfilename;
|
|
char *cmd;
|
|
int len;
|
|
FILE *fd;
|
|
#if HAVE_FILENO
|
|
int returnfd = 0;
|
|
#endif
|
|
|
|
if (!use_lessopen || secure)
|
|
return (NULL);
|
|
ch_ungetchar(-1);
|
|
if ((lessopen = lgetenv("LESSOPEN")) == NULL)
|
|
return (NULL);
|
|
while (*lessopen == '|')
|
|
{
|
|
/*
|
|
* If LESSOPEN starts with a |, it indicates
|
|
* a "pipe preprocessor".
|
|
*/
|
|
#if !HAVE_FILENO
|
|
error("LESSOPEN pipe is not supported", NULL_PARG);
|
|
return (NULL);
|
|
#else
|
|
lessopen++;
|
|
returnfd++;
|
|
#endif
|
|
}
|
|
if (*lessopen == '-')
|
|
{
|
|
/*
|
|
* Lessopen preprocessor will accept "-" as a filename.
|
|
*/
|
|
lessopen++;
|
|
} else
|
|
{
|
|
if (strcmp(filename, "-") == 0)
|
|
return (NULL);
|
|
}
|
|
if (num_pct_s(lessopen) != 1)
|
|
{
|
|
error("LESSOPEN ignored: must contain exactly one %%s", NULL_PARG);
|
|
return (NULL);
|
|
}
|
|
|
|
qfilename = shell_quote(filename);
|
|
len = (int) (strlen(lessopen) + strlen(qfilename) + 2);
|
|
cmd = (char *) ecalloc(len, sizeof(char));
|
|
SNPRINTF1(cmd, len, lessopen, qfilename);
|
|
free(qfilename);
|
|
fd = shellcmd(cmd);
|
|
free(cmd);
|
|
if (fd == NULL)
|
|
{
|
|
/*
|
|
* Cannot create the pipe.
|
|
*/
|
|
return (NULL);
|
|
}
|
|
#if HAVE_FILENO
|
|
if (returnfd)
|
|
{
|
|
char c;
|
|
int f;
|
|
|
|
/*
|
|
* The alt file is a pipe. Read one char
|
|
* to see if the pipe will produce any data.
|
|
* If it does, push the char back on the pipe.
|
|
*/
|
|
f = fileno(fd);
|
|
SET_BINARY(f);
|
|
if (read(f, &c, 1) != 1)
|
|
{
|
|
/*
|
|
* Pipe is empty.
|
|
* If more than 1 pipe char was specified,
|
|
* the exit status tells whether the file itself
|
|
* is empty, or if there is no alt file.
|
|
* If only one pipe char, just assume no alt file.
|
|
*/
|
|
int status = pclose(fd);
|
|
if (returnfd > 1 && status == 0) {
|
|
/* File is empty. */
|
|
*pfd = NULL;
|
|
*pf = -1;
|
|
return (save(FAKE_EMPTYFILE));
|
|
}
|
|
/* No alt file. */
|
|
return (NULL);
|
|
}
|
|
/* Alt pipe contains data, so use it. */
|
|
ch_ungetchar(c);
|
|
*pfd = (void *) fd;
|
|
*pf = f;
|
|
return (save("-"));
|
|
}
|
|
#endif
|
|
/* The alt file is a regular file. Read its name from LESSOPEN. */
|
|
cmd = readfd(fd);
|
|
pclose(fd);
|
|
if (*cmd == '\0')
|
|
{
|
|
/*
|
|
* Pipe is empty. This means there is no alt file.
|
|
*/
|
|
free(cmd);
|
|
return (NULL);
|
|
}
|
|
return (cmd);
|
|
#endif /* HAVE_POPEN */
|
|
}
|
|
|
|
/*
|
|
* Close a replacement file.
|
|
*/
|
|
public void close_altfile(char *altfilename, char *filename)
|
|
{
|
|
#if HAVE_POPEN
|
|
char *lessclose;
|
|
char *qfilename;
|
|
char *qaltfilename;
|
|
FILE *fd;
|
|
char *cmd;
|
|
int len;
|
|
|
|
if (secure)
|
|
return;
|
|
ch_ungetchar(-1);
|
|
if ((lessclose = lgetenv("LESSCLOSE")) == NULL)
|
|
return;
|
|
if (num_pct_s(lessclose) > 2)
|
|
{
|
|
error("LESSCLOSE ignored; must contain no more than 2 %%s", NULL_PARG);
|
|
return;
|
|
}
|
|
qfilename = shell_quote(filename);
|
|
qaltfilename = shell_quote(altfilename);
|
|
len = (int) (strlen(lessclose) + strlen(qfilename) + strlen(qaltfilename) + 2);
|
|
cmd = (char *) ecalloc(len, sizeof(char));
|
|
SNPRINTF2(cmd, len, lessclose, qfilename, qaltfilename);
|
|
free(qaltfilename);
|
|
free(qfilename);
|
|
fd = shellcmd(cmd);
|
|
free(cmd);
|
|
if (fd != NULL)
|
|
pclose(fd);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Is the specified file a directory?
|
|
*/
|
|
public int is_dir(char *filename)
|
|
{
|
|
int isdir = 0;
|
|
|
|
#if HAVE_STAT
|
|
{
|
|
int r;
|
|
struct stat statbuf;
|
|
|
|
r = stat(filename, &statbuf);
|
|
isdir = (r >= 0 && S_ISDIR(statbuf.st_mode));
|
|
}
|
|
#else
|
|
#ifdef _OSK
|
|
{
|
|
int f;
|
|
|
|
f = open(filename, S_IREAD | S_IFDIR);
|
|
if (f >= 0)
|
|
close(f);
|
|
isdir = (f >= 0);
|
|
}
|
|
#endif
|
|
#endif
|
|
return (isdir);
|
|
}
|
|
|
|
/*
|
|
* Returns NULL if the file can be opened and
|
|
* is an ordinary file, otherwise an error message
|
|
* (if it cannot be opened or is a directory, etc.)
|
|
*/
|
|
public char * bad_file(char *filename)
|
|
{
|
|
char *m = NULL;
|
|
|
|
if (!force_open && is_dir(filename))
|
|
{
|
|
static char is_a_dir[] = " is a directory";
|
|
|
|
m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir),
|
|
sizeof(char));
|
|
strcpy(m, filename);
|
|
strcat(m, is_a_dir);
|
|
} else
|
|
{
|
|
#if HAVE_STAT
|
|
int r;
|
|
struct stat statbuf;
|
|
|
|
r = stat(filename, &statbuf);
|
|
if (r < 0)
|
|
{
|
|
m = errno_message(filename);
|
|
} else if (force_open)
|
|
{
|
|
m = NULL;
|
|
} else if (!S_ISREG(statbuf.st_mode))
|
|
{
|
|
static char not_reg[] = " is not a regular file (use -f to see it)";
|
|
m = (char *) ecalloc(strlen(filename) + sizeof(not_reg),
|
|
sizeof(char));
|
|
strcpy(m, filename);
|
|
strcat(m, not_reg);
|
|
}
|
|
#endif
|
|
}
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Return the size of a file, as cheaply as possible.
|
|
* In Unix, we can stat the file.
|
|
*/
|
|
public POSITION filesize(int f)
|
|
{
|
|
#if HAVE_STAT
|
|
struct stat statbuf;
|
|
|
|
if (fstat(f, &statbuf) >= 0)
|
|
return ((POSITION) statbuf.st_size);
|
|
#else
|
|
#ifdef _OSK
|
|
long size;
|
|
|
|
if ((size = (long) _gs_size(f)) >= 0)
|
|
return ((POSITION) size);
|
|
#endif
|
|
#endif
|
|
return (seek_filesize(f));
|
|
}
|
|
|
|
public int curr_ifile_changed(void)
|
|
{
|
|
#if HAVE_STAT_INO
|
|
/*
|
|
* If the file's i-number or device has changed,
|
|
* or if the file is smaller than it previously was,
|
|
* the file must be different.
|
|
*/
|
|
struct stat st;
|
|
POSITION curr_pos = ch_tell();
|
|
int r = stat(get_filename(curr_ifile), &st);
|
|
if (r == 0 && (st.st_ino != curr_ino ||
|
|
st.st_dev != curr_dev ||
|
|
(curr_pos != NULL_POSITION && st.st_size < curr_pos)))
|
|
return (TRUE);
|
|
#endif
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
public char * shell_coption(void)
|
|
{
|
|
return ("-c");
|
|
}
|
|
|
|
/*
|
|
* Return last component of a pathname.
|
|
*/
|
|
public char * last_component(char *name)
|
|
{
|
|
char *slash;
|
|
|
|
for (slash = name + strlen(name); slash > name; )
|
|
{
|
|
--slash;
|
|
if (*slash == *PATHNAME_SEP || *slash == '/')
|
|
return (slash + 1);
|
|
}
|
|
return (name);
|
|
}
|