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tail: Fix -f with stdin

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Based on a patch from swills@.

MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D31113
This commit is contained in:
Mark Johnston 2021-07-08 17:40:59 -04:00
parent 02508a3d4e
commit 7e11889959
2 changed files with 21 additions and 24 deletions
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2
usr.bin/tail/extern.h
View File

@ -56,7 +56,7 @@ struct mapinfo {
struct file_info {
FILE *fp;
char *file_name;
const char *file_name;
struct stat st;
};

43
usr.bin/tail/tail.c
View File

@ -67,8 +67,6 @@ static const char sccsid[] = "@(#)tail.c 8.1 (Berkeley) 6/6/93";
int Fflag, fflag, qflag, rflag, rval, no_files;
fileargs_t *fa;
static file_info_t *files;
static void obsolete(char **);
static void usage(void);
@ -88,8 +86,8 @@ main(int argc, char *argv[])
FILE *fp;
off_t off;
enum STYLE style;
int i, ch, first;
file_info_t *file;
int ch, first;
file_info_t file, *filep, *files;
char *p;
cap_rights_t rights;
@ -206,30 +204,24 @@ main(int argc, char *argv[])
}
if (*argv && fflag) {
files = (struct file_info *) malloc(no_files *
sizeof(struct file_info));
if (!files)
files = malloc(no_files * sizeof(struct file_info));
if (files == NULL)
err(1, "Couldn't malloc space for file descriptors.");
for (file = files; (fn = *argv++); file++) {
file->file_name = strdup(fn);
if (! file->file_name)
errx(1, "Couldn't malloc space for file name.");
file->fp = fileargs_fopen(fa, file->file_name, "r");
if (file->fp == NULL ||
fstat(fileno(file->fp), &file->st)) {
if (file->fp != NULL) {
fclose(file->fp);
file->fp = NULL;
for (filep = files; (fn = *argv++); filep++) {
filep->file_name = fn;
filep->fp = fileargs_fopen(fa, filep->file_name, "r");
if (filep->fp == NULL ||
fstat(fileno(filep->fp), &filep->st)) {
if (filep->fp != NULL) {
fclose(filep->fp);
filep->fp = NULL;
}
if (!Fflag || errno != ENOENT)
ierr(file->file_name);
ierr(filep->file_name);
}
}
follow(files, style, off);
for (i = 0, file = files; i < no_files; i++, file++) {
free(file->file_name);
}
free(files);
} else if (*argv) {
for (first = 1; (fn = *argv++);) {
@ -266,10 +258,15 @@ main(int argc, char *argv[])
fflag = 0; /* POSIX.2 requires this. */
}
if (rflag)
if (rflag) {
reverse(stdin, fn, style, off, &sb);
else
} else if (fflag) {
file.file_name = fn;
file.fp = stdin;
follow(&file, style, off);
} else {
forward(stdin, fn, style, off, &sb);
}
}
fileargs_free(fa);
exit(rval);