pwdx.c: new usage & fix coding style
Coding style fixed and new help output. Signed-off-by: Sami Kerola <kerolasa@iki.fi>
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Sami Kerola
parent
4581ac2240
commit
4f7b9c661b
137
pwdx.c
137
pwdx.c
@ -1,94 +1,90 @@
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// Copyright 2004 Nicholas Miell
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//
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// This file may be used subject to the terms and conditions of the
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// GNU Library General Public License Version 2 as published by the
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// Free Software Foundation.This program is distributed in the hope
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// that it will be useful, but WITHOUT ANY WARRANTY; without even the
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// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the GNU Library General Public License for more
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// details.
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/*
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* Copyright 2004 Nicholas Miell
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*
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* This file may be used subject to the terms and conditions of the
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* GNU Library General Public License Version 2 as published by the
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* Free Software Foundation.This program is distributed in the hope
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* that it will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Library General Public License for more
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* details.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <regex.h>
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#include <limits.h>
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#include <unistd.h>
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#include <errno.h>
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#include <getopt.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "proc/version.h"
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static void die(const char *msg) NORETURN;
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static void die(const char *msg)
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static void __attribute__ ((__noreturn__)) usage(FILE * out)
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{
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fputs(msg, stderr);
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exit(1);
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}
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fprintf(out, "\nUsage:\n"
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" %s [options] pid...\n", program_invocation_short_name);
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fprintf(out,
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"\nOptions:\n"
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" -V, --version output version information and exit\n"
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" -h, --help output help screen and exit\n\n");
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static void version(void) NORETURN;
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static void version(void)
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{
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printf("pwdx (%s)\n", procps_version);
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exit(0);
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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int main(int argc, char *argv[])
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{
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regex_t re;
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int i;
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if (argc < 2)
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die("Usage: pwdx pid...\n");
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// Allowed on the command line:
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//
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// --version
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// -V
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// /proc/nnnn
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// nnnn
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//
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// where nnnn is any number that doesn't begin with 0.
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//
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// If --version or -V are present, further arguments are ignored
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// completely.
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regcomp(&re, "^((/proc/+)?[1-9][0-9]*|-V|--version)$",
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REG_EXTENDED|REG_NOSUB);
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for (i = 1; i < argc; i++) {
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if (regexec(&re, argv[i], 0, NULL, 0) != 0) {
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/* Constant 27 is the length of the error string "pwdx: ... " */
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char buf[27 + strlen (argv[i]) + 1];
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snprintf(buf, sizeof buf, "pwdx: invalid process id: %s\n", argv[i]);
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buf[sizeof(buf)-1] = '\0';
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die(buf);
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}
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if (!strcmp("-V", argv[i]) || !strcmp("--version", argv[i]))
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version();
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}
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regfree(&re);
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char ch;
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int retval = 0, i;
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int alloclen = 128;
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char *pathbuf = malloc(alloclen);
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char *pathbuf;
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for (i = 1; i < argc; i++) {
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static const struct option longopts[] = {
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{NULL, 0, 0, 0}
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};
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while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
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switch (ch) {
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case 'V':
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display_version();
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return EXIT_SUCCESS;
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case 'h':
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usage(stdout);
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default:
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usage(stderr);
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage(stderr);
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pathbuf = malloc(alloclen);
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for (i = 0; i < argc; i++) {
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char *s;
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int len;
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ssize_t len;
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/* Constant 10 is the length of strings "/proc/" + "/cwd" + 1 */
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char buf[10 + strlen(argv[i]) + 1];
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// At this point, all arguments are in the form /proc/nnnn
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// or nnnn, so a simple check based on the first char is
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// possible
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/*
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* At this point, all arguments are in the form
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* /proc/NNNN or NNNN, so a simple check based on
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* the first char is possible
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*/
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if (argv[i][0] != '/')
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snprintf(buf, sizeof buf, "/proc/%s/cwd", argv[i]);
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else
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snprintf(buf, sizeof buf, "%s/cwd", argv[i]);
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// buf contains /proc/nnnn/cwd symlink name on entry, the
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// target of that symlink on return
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/*
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* buf contains /proc/NNNN/cwd symlink name
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* on entry, the target of that symlink on return
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*/
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while ((len = readlink(buf, pathbuf, alloclen)) == alloclen) {
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alloclen *= 2;
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pathbuf = realloc(pathbuf, alloclen);
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@ -96,6 +92,7 @@ int main(int argc, char* argv[])
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if (len < 0) {
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s = strerror(errno == ENOENT ? ESRCH : errno);
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retval = 1;
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} else {
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pathbuf[len] = 0;
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s = pathbuf;
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@ -104,5 +101,5 @@ int main(int argc, char* argv[])
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printf("%s: %s\n", argv[i], s);
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}
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return 0;
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return retval;
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}
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