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