freebsd-dev/usr.bin/nl/nl.c
Warner Losh 353bb0a3f8 Avoid 'bogus' uninitialized warning by initializing rather than
playing cute games.  It is much simpler, clearer and easier to follow
and understand.  Besides, gcc4 likes it better.
2006-12-22 05:54:19 +00:00

426 lines
11 KiB
C

/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 1999\
The NetBSD Foundation, Inc. All rights reserved.");
__RCSID("$FreeBSD$");
#endif
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <locale.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
typedef enum {
number_all, /* number all lines */
number_nonempty, /* number non-empty lines */
number_none, /* no line numbering */
number_regex /* number lines matching regular expression */
} numbering_type;
struct numbering_property {
const char * const name; /* for diagnostics */
numbering_type type; /* numbering type */
regex_t expr; /* for type == number_regex */
};
/* line numbering formats */
#define FORMAT_LN "%-*d" /* left justified, leading zeros suppressed */
#define FORMAT_RN "%*d" /* right justified, leading zeros suppressed */
#define FORMAT_RZ "%0*d" /* right justified, leading zeros kept */
#define FOOTER 0
#define BODY 1
#define HEADER 2
#define NP_LAST HEADER
static struct numbering_property numbering_properties[NP_LAST + 1] = {
{ "footer", number_none },
{ "body", number_nonempty },
{ "header", number_none }
};
#define max(a, b) ((a) > (b) ? (a) : (b))
/*
* Maximum number of characters required for a decimal representation of a
* (signed) int; courtesy of tzcode.
*/
#define INT_STRLEN_MAXIMUM \
((sizeof (int) * CHAR_BIT - 1) * 302 / 1000 + 2)
static void filter(void);
static void parse_numbering(const char *, int);
static void usage(void);
/*
* Pointer to dynamically allocated input line buffer, and its size.
*/
static char *buffer;
static size_t buffersize;
/*
* Dynamically allocated buffer suitable for string representation of ints.
*/
static char *intbuffer;
/* delimiter characters that indicate the start of a logical page section */
static char delim[2 * MB_LEN_MAX];
static int delimlen;
/*
* Configurable parameters.
*/
/* line numbering format */
static const char *format = FORMAT_RN;
/* increment value used to number logical page lines */
static int incr = 1;
/* number of adjacent blank lines to be considered (and numbered) as one */
static unsigned int nblank = 1;
/* whether to restart numbering at logical page delimiters */
static int restart = 1;
/* characters used in separating the line number and the corrsp. text line */
static const char *sep = "\t";
/* initial value used to number logical page lines */
static int startnum = 1;
/* number of characters to be used for the line number */
/* should be unsigned but required signed by `*' precision conversion */
static int width = 6;
int
main(argc, argv)
int argc;
char *argv[];
{
int c;
long val;
unsigned long uval;
char *ep;
size_t intbuffersize, clen;
char delim1[MB_LEN_MAX] = { '\\' }, delim2[MB_LEN_MAX] = { ':' };
size_t delim1len = 1, delim2len = 1;
(void)setlocale(LC_ALL, "");
while ((c = getopt(argc, argv, "pb:d:f:h:i:l:n:s:v:w:")) != -1) {
switch (c) {
case 'p':
restart = 0;
break;
case 'b':
parse_numbering(optarg, BODY);
break;
case 'd':
clen = mbrlen(optarg, MB_CUR_MAX, NULL);
if (clen == (size_t)-1 || clen == (size_t)-2)
errc(EXIT_FAILURE, EILSEQ, NULL);
if (clen != 0) {
memcpy(delim1, optarg, delim1len = clen);
clen = mbrlen(optarg + delim1len,
MB_CUR_MAX, NULL);
if (clen == (size_t)-1 ||
clen == (size_t)-2)
errc(EXIT_FAILURE, EILSEQ, NULL);
if (clen != 0) {
memcpy(delim2, optarg + delim1len,
delim2len = clen);
if (optarg[delim1len + clen] != '\0')
errx(EXIT_FAILURE,
"invalid delim argument -- %s",
optarg);
}
}
break;
case 'f':
parse_numbering(optarg, FOOTER);
break;
case 'h':
parse_numbering(optarg, HEADER);
break;
case 'i':
errno = 0;
val = strtol(optarg, &ep, 10);
if ((ep != NULL && *ep != '\0') ||
((val == LONG_MIN || val == LONG_MAX) && errno != 0))
errx(EXIT_FAILURE,
"invalid incr argument -- %s", optarg);
incr = (int)val;
break;
case 'l':
errno = 0;
uval = strtoul(optarg, &ep, 10);
if ((ep != NULL && *ep != '\0') ||
(uval == ULONG_MAX && errno != 0))
errx(EXIT_FAILURE,
"invalid num argument -- %s", optarg);
nblank = (unsigned int)uval;
break;
case 'n':
if (strcmp(optarg, "ln") == 0) {
format = FORMAT_LN;
} else if (strcmp(optarg, "rn") == 0) {
format = FORMAT_RN;
} else if (strcmp(optarg, "rz") == 0) {
format = FORMAT_RZ;
} else
errx(EXIT_FAILURE,
"illegal format -- %s", optarg);
break;
case 's':
sep = optarg;
break;
case 'v':
errno = 0;
val = strtol(optarg, &ep, 10);
if ((ep != NULL && *ep != '\0') ||
((val == LONG_MIN || val == LONG_MAX) && errno != 0))
errx(EXIT_FAILURE,
"invalid startnum value -- %s", optarg);
startnum = (int)val;
break;
case 'w':
errno = 0;
val = strtol(optarg, &ep, 10);
if ((ep != NULL && *ep != '\0') ||
((val == LONG_MIN || val == LONG_MAX) && errno != 0))
errx(EXIT_FAILURE,
"invalid width value -- %s", optarg);
width = (int)val;
if (!(width > 0))
errx(EXIT_FAILURE,
"width argument must be > 0 -- %d",
width);
break;
case '?':
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
switch (argc) {
case 0:
break;
case 1:
if (freopen(argv[0], "r", stdin) == NULL)
err(EXIT_FAILURE, "%s", argv[0]);
break;
default:
usage();
/* NOTREACHED */
}
/* Generate the delimiter sequence */
memcpy(delim, delim1, delim1len);
memcpy(delim + delim1len, delim2, delim2len);
delimlen = delim1len + delim2len;
/* Determine the maximum input line length to operate on. */
if ((val = sysconf(_SC_LINE_MAX)) == -1) /* ignore errno */
val = LINE_MAX;
/* Allocate sufficient buffer space (including the terminating NUL). */
buffersize = (size_t)val + 1;
if ((buffer = malloc(buffersize)) == NULL)
err(EXIT_FAILURE, "cannot allocate input line buffer");
/* Allocate a buffer suitable for preformatting line number. */
intbuffersize = max(INT_STRLEN_MAXIMUM, width) + 1; /* NUL */
if ((intbuffer = malloc(intbuffersize)) == NULL)
err(EXIT_FAILURE, "cannot allocate preformatting buffer");
/* Do the work. */
filter();
exit(EXIT_SUCCESS);
/* NOTREACHED */
}
static void
filter()
{
int line; /* logical line number */
int section; /* logical page section */
unsigned int adjblank; /* adjacent blank lines */
int consumed; /* intbuffer measurement */
int donumber = 0, idx;
adjblank = 0;
line = startnum;
section = BODY;
while (fgets(buffer, (int)buffersize, stdin) != NULL) {
for (idx = FOOTER; idx <= NP_LAST; idx++) {
/* Does it look like a delimiter? */
if (memcmp(buffer + delimlen * idx, delim,
delimlen) == 0) {
/* Was this the whole line? */
if (buffer[delimlen * (idx + 1)] == '\n') {
section = idx;
adjblank = 0;
if (restart)
line = startnum;
goto nextline;
}
} else {
break;
}
}
switch (numbering_properties[section].type) {
case number_all:
/*
* Doing this for number_all only is disputable, but
* the standard expresses an explicit dependency on
* `-b a' etc.
*/
if (buffer[0] == '\n' && ++adjblank < nblank)
donumber = 0;
else
donumber = 1, adjblank = 0;
break;
case number_nonempty:
donumber = (buffer[0] != '\n');
break;
case number_none:
donumber = 0;
break;
case number_regex:
donumber =
(regexec(&numbering_properties[section].expr,
buffer, 0, NULL, 0) == 0);
break;
}
if (donumber) {
/* Note: sprintf() is safe here. */
consumed = sprintf(intbuffer, format, width, line);
(void)printf("%s",
intbuffer + max(0, consumed - width));
line += incr;
} else {
(void)printf("%*s", width, "");
}
(void)printf("%s%s", sep, buffer);
if (ferror(stdout))
err(EXIT_FAILURE, "output error");
nextline:
;
}
if (ferror(stdin))
err(EXIT_FAILURE, "input error");
}
/*
* Various support functions.
*/
static void
parse_numbering(argstr, section)
const char *argstr;
int section;
{
int error;
char errorbuf[NL_TEXTMAX];
switch (argstr[0]) {
case 'a':
numbering_properties[section].type = number_all;
break;
case 'n':
numbering_properties[section].type = number_none;
break;
case 't':
numbering_properties[section].type = number_nonempty;
break;
case 'p':
/* If there was a previous expression, throw it away. */
if (numbering_properties[section].type == number_regex)
regfree(&numbering_properties[section].expr);
else
numbering_properties[section].type = number_regex;
/* Compile/validate the supplied regular expression. */
if ((error = regcomp(&numbering_properties[section].expr,
&argstr[1], REG_NEWLINE|REG_NOSUB)) != 0) {
(void)regerror(error,
&numbering_properties[section].expr,
errorbuf, sizeof (errorbuf));
errx(EXIT_FAILURE,
"%s expr: %s -- %s",
numbering_properties[section].name, errorbuf,
&argstr[1]);
}
break;
default:
errx(EXIT_FAILURE,
"illegal %s line numbering type -- %s",
numbering_properties[section].name, argstr);
}
}
static void
usage()
{
(void)fprintf(stderr,
"usage: nl [-p] [-b type] [-d delim] [-f type] [-h type] [-i incr] [-l num]\n"
" [-n format] [-s sep] [-v startnum] [-w width] [file]\n");
exit(EXIT_FAILURE);
}