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/*
* mkstemp.c -- create a temporary file
*
* This code is Copyright (c) 2014 by the authors of nmh.
* See the COPYRIGHT file in the root directory of the nmh
* distribution for complete copyright information.
*/
/* define NMH to 0 to remove dependencies on nmh. */
#ifndef NMH
# define NMH 1
#endif /* ! NMH */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#if ! defined HAVE_MKSTEMPS
# define HAVE_MKSTEMPS 0
#endif /* ! HAVE_MKSTEMPS */
char *build_template(const char *, const char *, const char *);
void process_args(int, char **, const char **, const char **, const char **);
/*
* Use a template of the form:
* [directory/][prefix]XXXXXX[suffix]
* where some of those named components might be null. suffix is only
* supported if HAVE_MKSTEMPS.
*/
int
main(int argc, char *argv[]) {
const char *directory = "", *prefix = "", *suffix = "";
size_t suffix_len;
int fd;
char *template;
process_args(argc, argv, &directory, &prefix, &suffix);
if ((template = build_template(directory, prefix, suffix)) == NULL) {
return -1;
}
if ((suffix_len = strlen(suffix)) > 0) {
# if HAVE_MKSTEMPS
if ((fd = mkstemps(template, suffix_len)) < 0) { perror("mkstemps"); }
# else /* ! HAVE_MKSTEMPS */
fd = 0;
# endif /* ! HAVE_MKSTEMPS */
} else {
if ((fd = mkstemp(template)) < 0) { perror("mkstemp"); }
}
if (fd >= 0) {
(void) puts(template);
(void) close(fd);
}
free(template);
return fd >= 0 ? 0 : -1;
}
char *
build_template(const char *directory, const char *prefix, const char *suffix) {
const char pattern[] = "XXXXXX";
size_t len, directory_len, pathsep_len, prefix_len, suffix_len;
char *template;
directory_len = strlen(directory);
if (directory_len > 0) {
pathsep_len = 1;
if (directory[directory_len - 1] == '/') {
/* Will insert a '/' separately, so truncate the one provided
in the directory name. */
--directory_len;
}
} else {
pathsep_len = 0;
}
prefix_len = strlen(prefix);
suffix_len = strlen(suffix);
/* sizeof pattern includes its final NULL, so don't add another. */
len = directory_len + pathsep_len + prefix_len + sizeof pattern +
suffix_len;
if ((template = malloc(len))) {
char *tp = template;
(void) strncpy(tp, directory, directory_len);
tp += directory_len;
if (pathsep_len == 1) { *tp++ = '/'; }
(void) strncpy(tp, prefix, prefix_len);
tp += prefix_len;
(void) strncpy(tp, pattern, sizeof pattern - 1);
tp += sizeof pattern - 1;
(void) strncpy(tp, suffix, suffix_len);
/* tp += suffix_len; */
template[len-1] = '\0';
return template;
} else {
perror("malloc");
return NULL;
}
}
#if NMH
#include <h/mh.h>
#if HAVE_MKSTEMPS
# define MHFIXMSG_SWITCHES \
X("directory", 0, DIRECTORYSW) \
X("prefix", 0, PREFIXSW) \
X("suffix", 0, SUFFIXSW) \
X("version", 0, VERSIONSW) \
X("help", 0, HELPSW)
#else /* ! HAVE_MKSTEMPS */
# define MHFIXMSG_SWITCHES \
X("directory", 0, DIRECTORYSW) \
X("prefix", 0, PREFIXSW) \
X("version", 0, VERSIONSW) \
X("help", 0, HELPSW)
#endif /* ! HAVE_MKSTEMPS */
#define X(sw, minchars, id) id,
DEFINE_SWITCH_ENUM(MHFIXMSG);
#undef X
#define X(sw, minchars, id) { sw, minchars, id },
DEFINE_SWITCH_ARRAY(MHFIXMSG, switches);
#undef X
void
process_args(int argc, char **argv, const char **directory,
const char **prefix, const char **suffix) {
char **argp, **arguments, *cp, buf[100];
# if ! HAVE_MKSTEMPS
NMH_UNUSED(suffix);
# endif /* ! HAVE_MKSTEMPS */
if (nmh_init(argv[0], 1)) { done(NOTOK); }
arguments = getarguments (invo_name, argc, argv, 1);
argp = arguments;
/*
* Parse arguments
*/
while ((cp = *argp++)) {
if (*cp == '-') {
switch (smatch(++cp, switches)) {
case AMBIGSW:
ambigsw(cp, switches);
done(NOTOK);
case UNKWNSW:
advise (NULL, "-%s unknown", cp);
(void) snprintf(buf, sizeof buf, "%s [switches]", invo_name);
print_help(buf, switches, 1);
done(NOTOK);
case HELPSW:
(void) snprintf(buf, sizeof buf, "%s [switches]", invo_name);
print_help(buf, switches, 1);
done(OK);
case VERSIONSW:
print_version(invo_name);
done(OK);
case DIRECTORYSW:
/* Allow the directory to start with '-'. */
if ((cp = *argp++) == NULL) {
adios(NULL, "missing argument to %s", argp[-2]);
}
*directory = cp;
continue;
case PREFIXSW:
/* Allow the prefix to start with '-'. */
if ((cp = *argp++) == NULL) {
adios(NULL, "missing argument to %s", argp[-2]);
}
*prefix = cp;
continue;
# if HAVE_MKSTEMPS
case SUFFIXSW:
/* Allow the suffix to start with '-'. */
if ((cp = *argp++) == NULL) {
adios(NULL, "missing argument to %s", argp[-2]);
}
*suffix = cp;
continue;
# endif /* HAVE_MKSTEMPS */
}
}
}
}
#else /* ! NMH */
void
process_args(int argc, char **argv, const char **directory,
const char **prefix, const char **suffix) {
# if HAVE_MKSTEMPS
const char usage[] =
"usage: %s [-h] [-d directory] [-p prefix] [-s suffix]\n";
const char optstring[] = "d:hp:s:";
# else /* ! HAVE_MKSTEMPS */
const char usage[] = "usage: %s [-h] [-d directory] [-p prefix]\n";
const char optstring[] = "d:hp:";
# endif /* ! HAVE_MKSTEMPS */
int opt;
while ((opt = getopt(argc, argv, optstring)) != -1) {
switch (opt) {
case 'd':
*directory = optarg;
break;
case 'p':
*prefix = optarg;
break;
case 's':
*suffix = optarg;
break;
case 'h':
(void) printf(usage, argv[0]);
exit(0);
default:
(void) fprintf(stderr, usage, argv[0]);
exit(-1);
}
}
}
#endif /* ! NMH */
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