diplodocus.org Git - nmh/blob - uip/mkstemp.c

   1 /* mkstemp.c -- create a temporary file
   2  *
   3  * This code is Copyright (c) 2014 by the authors of nmh.
   4  * See the COPYRIGHT file in the root directory of the nmh
   5  * distribution for complete copyright information.
   6  */
   7
   8 /* define NMH to 0 to remove dependencies on nmh. */
   9 #ifndef NMH
  10 #   define NMH 1
  11 #endif /* ! NMH */
  12
  13 #ifdef HAVE_CONFIG_H
  14 #   include <config.h>
  15 #endif /* HAVE_CONFIG_H */
  16 #include <unistd.h>
  17 #include <stdlib.h>
  18 #include <stdbool.h>
  19 #include <string.h>
  20 #include <stdio.h>
  21
  22 #if ! defined HAVE_MKSTEMPS
  23 #   define HAVE_MKSTEMPS 0
  24 #endif /* ! HAVE_MKSTEMPS */
  25
  26 static char *build_template(const char *, const char *, const char *);
  27 static void process_args(int, char **, const char **, const char **, const char **);
  28
  29 /*
  30  * Use a template of the form:
  31  *     [directory/][prefix]XXXXXX[suffix]
  32  * where some of those named components might be null.  suffix is only
  33  * supported if HAVE_MKSTEMPS.
  34  */
  35
  36 int
  37 main(int argc, char *argv[]) {
  38     const char *directory = "", *prefix = "", *suffix = "";
  39     size_t suffix_len;
  40     int fd;
  41     char *template;
  42
  43     process_args(argc, argv, &directory, &prefix, &suffix);
  44     if ((template = build_template(directory, prefix, suffix)) == NULL) {
  45         return 1;
  46     }
  47
  48     if ((suffix_len = strlen(suffix)) > 0) {
  49 #       if HAVE_MKSTEMPS
  50         if ((fd = mkstemps(template, suffix_len)) < 0) { perror("mkstemps"); }
  51 #       else  /* ! HAVE_MKSTEMPS */
  52         fd = 0;
  53 #       endif /* ! HAVE_MKSTEMPS */
  54     } else {
  55         if ((fd = mkstemp(template)) < 0) { perror("mkstemp"); }
  56     }
  57
  58     if (fd >= 0) {
  59         (void) puts(template);
  60         (void) close(fd);
  61     }
  62
  63     free(template);
  64
  65     return fd >= 0  ?  0  :  1;
  66 }
  67
  68
  69 static char *
  70 build_template(const char *directory, const char *prefix, const char *suffix) {
  71     const char pattern[] = "XXXXXX";
  72     size_t len, directory_len, pathsep_len, prefix_len, suffix_len;
  73     char *template;
  74
  75     directory_len = strlen(directory);
  76     if (directory_len > 0) {
  77         pathsep_len = 1;
  78         if (directory[directory_len - 1] == '/') {
  79             /* Will insert a '/' separately, so truncate the one provided
  80                in the directory name. */
  81             --directory_len;
  82         }
  83     } else {
  84         pathsep_len = 0;
  85     }
  86     prefix_len = strlen(prefix);
  87     suffix_len = strlen(suffix);
  88     /* sizeof pattern includes its final NULL, so don't add another. */
  89     len = directory_len  +  pathsep_len  +  prefix_len  +   sizeof pattern  +
  90         suffix_len;
  91
  92     if ((template = malloc(len))) {
  93         char *tp = template;
  94
  95         (void) strncpy(tp, directory, directory_len);
  96         tp += directory_len;
  97
  98         if (pathsep_len == 1) { *tp++ = '/'; }
  99
 100         (void) strncpy(tp, prefix, prefix_len);
 101         tp += prefix_len;
 102
 103         (void) strncpy(tp, pattern, sizeof pattern - 1);
 104         tp += sizeof pattern - 1;
 105
 106         (void) strncpy(tp, suffix, suffix_len);
 107         /* tp += suffix_len; */
 108
 109         template[len-1] = '\0';
 110
 111         return template;
 112     }
 113
 114     perror("malloc");
 115     return NULL;
 116 }
 117
 118
 119 #if NMH
 120 #include <h/mh.h>
 121 #include <h/utils.h>
 122
 123 #if HAVE_MKSTEMPS
 124 #   define MHFIXMSG_SWITCHES \
 125     X("directory", 0, DIRECTORYSW) \
 126     X("prefix", 0, PREFIXSW) \
 127     X("suffix", 0, SUFFIXSW) \
 128     X("version", 0, VERSIONSW) \
 129     X("help", 0, HELPSW)
 130 #else  /* ! HAVE_MKSTEMPS */
 131 #   define MHFIXMSG_SWITCHES \
 132     X("directory", 0, DIRECTORYSW) \
 133     X("prefix", 0, PREFIXSW) \
 134     X("version", 0, VERSIONSW) \
 135     X("help", 0, HELPSW)
 136 #endif /* ! HAVE_MKSTEMPS */
 137
 138 #define X(sw, minchars, id) id,
 139 DEFINE_SWITCH_ENUM(MHFIXMSG);
 140 #undef X
 141
 142 #define X(sw, minchars, id) { sw, minchars, id },
 143 DEFINE_SWITCH_ARRAY(MHFIXMSG, switches);
 144 #undef X
 145
 146 static void
 147 process_args(int argc, char **argv, const char **directory,
 148              const char **prefix, const char **suffix) {
 149     char **argp, **arguments, *cp, buf[100];
 150 #   if ! HAVE_MKSTEMPS
 151     NMH_UNUSED(suffix);
 152 #   endif /* ! HAVE_MKSTEMPS */
 153
 154     if (nmh_init(argv[0], 2)) { done(1); }
 155     arguments = getarguments (invo_name, argc, argv, 1);
 156     argp = arguments;
 157
 158     /*
 159      * Parse arguments
 160      */
 161     while ((cp = *argp++)) {
 162         if (*cp == '-') {
 163             switch (smatch(++cp, switches)) {
 164             case AMBIGSW:
 165                 ambigsw(cp, switches);
 166                 done(1);
 167             case UNKWNSW:
 168                 inform("-%s unknown", cp);
 169                 (void) snprintf(buf, sizeof buf, "%s [switches]", invo_name);
 170                 print_help(buf, switches, 1);
 171                 done(1);
 172             case HELPSW:
 173                 (void) snprintf(buf, sizeof buf, "%s [switches]", invo_name);
 174                 print_help(buf, switches, 1);
 175                 done(OK);
 176             case VERSIONSW:
 177                 print_version(invo_name);
 178                 done(OK);
 179
 180             case DIRECTORYSW:
 181                 /* Allow the directory to start with '-'. */
 182                 if ((cp = *argp++) == NULL) {
 183                     adios(NULL, "missing argument to %s", argp[-2]);
 184                 }
 185                 *directory = cp;
 186                 continue;
 187
 188             case PREFIXSW:
 189                 /* Allow the prefix to start with '-'. */
 190                 if ((cp = *argp++) == NULL) {
 191                     adios(NULL, "missing argument to %s", argp[-2]);
 192                 }
 193                 *prefix = cp;
 194                 continue;
 195
 196 #           if HAVE_MKSTEMPS
 197             case SUFFIXSW:
 198                 /* Allow the suffix to start with '-'. */
 199                 if ((cp = *argp++) == NULL) {
 200                     adios(NULL, "missing argument to %s", argp[-2]);
 201                 }
 202                 *suffix = cp;
 203                 continue;
 204 #           endif /* HAVE_MKSTEMPS */
 205             }
 206         }
 207     }
 208 }
 209 #else  /* ! NMH */
 210 static void
 211 process_args(int argc, char **argv, const char **directory,
 212              const char **prefix, const char **suffix) {
 213 #   if HAVE_MKSTEMPS
 214     const char usage[] =
 215         "usage: %s [-h] [-d directory] [-p prefix] [-s suffix]\n";
 216     const char optstring[] = "d:hp:s:";
 217 #   else  /* ! HAVE_MKSTEMPS */
 218     const char usage[] = "usage: %s [-h] [-d directory] [-p prefix]\n";
 219     const char optstring[] = "d:hp:";
 220 #   endif /* ! HAVE_MKSTEMPS */
 221     int opt;
 222
 223     while ((opt = getopt(argc, argv, optstring)) != -1) {
 224         switch (opt) {
 225         case 'd':
 226             *directory = optarg;
 227             break;
 228         case 'p':
 229             *prefix = optarg;
 230             break;
 231         case 's':
 232             *suffix = optarg;
 233             break;
 234         case 'h':
 235             (void) printf(usage, argv[0]);
 236             exit(0);
 237         default:
 238             (void) fprintf(stderr, usage, argv[0]);
 239             exit(1);
 240         }
 241     }
 242 }
 243 #endif /* ! NMH */