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

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