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sortix--sortix/utils/mktemp.c
Jonas 'Sortie' Termansen 2b72262b4f Relicense Sortix to the ISC license.
I hereby relicense all my work on Sortix under the ISC license as below.

All Sortix contributions by other people are already under this license,
are not substantial enough to be copyrightable, or have been removed.

All imported code from other projects is compatible with this license.

All GPL licensed code from other projects had previously been removed.

Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors.

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
2016-03-05 22:21:50 +01:00

276 lines
7.1 KiB
C

/*
* Copyright (c) 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* mktemp.c
* Create temporary files and directories.
*/
#include <errno.h>
#include <error.h>
#include <limits.h>
#include <locale.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
__attribute__((format(printf, 1, 2)))
char* print_string(const char* format, ...)
{
va_list ap;
va_start(ap, format);
char* ret;
if ( vasprintf(&ret, format, ap) < 0 )
ret = NULL;
va_end(ap);
return ret;
}
char* join_paths(const char* a, const char* b)
{
size_t a_len = strlen(a);
bool has_slash = (a_len && a[a_len-1] == '/') || b[0] == '/';
return has_slash ? print_string("%s%s", a, b) : print_string("%s/%s", a, b);
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]... [TEMPLATE]\n", argv0);
fprintf(fp, "Create a temporary file or directory, safely, and print its name.\n");
fprintf(fp, "TEMPLATE must contain at least 6 consecutive 'X's in last component.\n");
fprintf(fp, "If TEMPLATE is not specified, use tmp.XXXXXX, and --tmpdir is implied.\n");
fprintf(fp, "Files are created u+rw, and directories u+rwx, minus umask restrictions.\n");
fprintf(fp, "\n");
fprintf(fp, " -d, --directory create a directory, not a file\n");
fprintf(fp, " -p, --tmpdir[=DIR] interpret TEMPLATE relative to DIR.\n");
fprintf(fp, " -t interpret TEMPLATE as a single file name component,\n");
fprintf(fp, " relative to a directory.\n");
fprintf(fp, " --suffix=SUFF append SUFF to TEMPLATE. SUFF must not contain slash.\n");
fprintf(fp, " This option is implied if TEMPLATE does not end in X.\n");
fprintf(fp, " -q, --quiet suppress diagnostics about file/dir-creation failure\n");
fprintf(fp, " --help display this help and exit\n");
fprintf(fp, " --version output version information and exit\n");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
bool directory = false;
bool quiet = false;
bool rooted = false;
const char* suffix = NULL;
const char* tmpdir = getenv("TMPDIR");
if ( !tmpdir )
tmpdir = "/tmp";
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
char c;
while ( (c = *++arg) ) switch ( c )
{
case 'd': directory = true; break;
case 'p':
if ( !*(tmpdir = arg + 1) )
{
if ( i + 1 == argc )
{
error(0, 0, "option requires an argument -- 'p'");
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
exit(125);
}
tmpdir = argv[i+1];
argv[++i] = NULL;
}
rooted = true;
arg = "p";
break;
case 't': rooted = true; break;
case 'q': quiet = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--directory") )
directory = true;
else if ( !strncmp(arg, "--suffix=", strlen("--suffix=")) )
suffix = arg + strlen("--suffix=");
else if ( !strcmp(arg, "--suffix") )
{
if ( i + 1 == argc )
{
error(0, 0, "option '--suffix' requires an argument");
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
exit(125);
}
suffix = argv[i+1];
argv[++i] = NULL;
}
else if ( !strncmp(arg, "--tmpdir=", strlen("--tmpdir=")) )
{
tmpdir = arg + strlen("--tmpdir=");
rooted = true;
}
else if ( !strcmp(arg, "--tmpdir") )
{
if ( i + 1 == argc )
{
error(0, 0, "option '--tmpdir' requires an argument");
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
exit(125);
}
tmpdir = argv[i+1];
argv[++i] = NULL;
rooted = true;
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
compact_arguments(&argc, &argv);
if ( quiet && !freopen("/dev/null", "w", stderr) )
close(2);
if ( 3 <= argc )
{
error(0, 0, "too many templates");
fprintf(stderr, "Try `%s --help' for more information\n", argv0);
exit(1);
}
// TODO: Add support for an arbitrary amount of X's in mkstemps and use it.
// Then increase the default below to 10 X's and in --help as well.
const char* input_templ;
if ( 2 <= argc )
{
input_templ = argv[1];
}
else
{
input_templ = "tmp.XXXXXX";
rooted = true;
}
char* templ;
if ( rooted )
{
templ = join_paths(tmpdir, input_templ);
if ( !templ )
error(1, errno, "malloc");
}
else
{
templ = strdup(input_templ);
if ( !templ )
error(1, errno, "malloc");
}
size_t suffix_length;
if ( suffix )
{
suffix_length = strlen(suffix);
if ( INT_MAX < suffix_length )
error(1, 0, "suffix is too long");
char* new_templ;
if ( asprintf(&new_templ, "%s%s", templ, suffix) < 0 )
error(1, errno, "malloc");
free(templ);
templ = new_templ;
}
else
{
size_t templ_length = strlen(templ);
suffix_length = 0;
while ( templ_length - suffix_length &&
templ[templ_length - suffix_length - 1] != 'X' &&
templ[templ_length - suffix_length - 1] != '/' )
suffix_length++;
}
size_t templ_length = strlen(templ);
size_t xcount = 0;
while ( templ_length - (suffix_length + xcount) &&
templ[templ_length - (suffix_length + xcount) - 1] == 'X' )
xcount++;
if ( xcount < 6 )
error(1, 0, "too few X's in template `%s'", templ);
char* path = strdup(templ);
if ( !path )
error(1, errno, "strdup");
if ( directory )
{
if ( !mkdtemps(path, suffix_length) )
error(1, errno, "%s", templ);
}
else
{
if ( INT_MAX < suffix_length )
error(1, 0, "suffix is too long");
int fd = mkstemps(path, (int) suffix_length);
if ( fd < 0 )
error(1, errno, "%s", templ);
close(fd);
}
puts(path);
free(path);
free(templ);
if ( ferror(stdout) || fflush(stdout) == EOF )
return 1;
return 0;
}