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