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 {
  39     const char *directory = "", *prefix = "", *suffix = "";
  40     size_t suffix_len;
  41     int fd;
  42     char *template;
  43
  44     process_args(argc, argv, &directory, &prefix, &suffix);
  45     if ((template = build_template(directory, prefix, suffix)) == NULL) {
  46         return 1;
  47     }
  48
  49     if ((suffix_len = strlen(suffix)) > 0) {
  50 #       if HAVE_MKSTEMPS
  51         if ((fd = mkstemps(template, suffix_len)) < 0) { perror("mkstemps"); }
  52 #       else  /* ! HAVE_MKSTEMPS */
  53         fd = 0;
  54 #       endif /* ! HAVE_MKSTEMPS */
  55     } else {
  56         if ((fd = mkstemp(template)) < 0) { perror("mkstemp"); }
  57     }
  58
  59     if (fd >= 0) {
  60         (void) puts(template);
  61         (void) close(fd);
  62     }
  63
  64     free(template);
  65
  66     return fd >= 0  ?  0  :  1;
  67 }
  68
  69
  70 static char *
  71 build_template(const char *directory, const char *prefix, const char *suffix)
  72 {
  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 #include "h/done.h"
 124 #include <h/utils.h>
 125
 126 #if HAVE_MKSTEMPS
 127 #   define MHFIXMSG_SWITCHES \
 128     X("directory", 0, DIRECTORYSW) \
 129     X("prefix", 0, PREFIXSW) \
 130     X("suffix", 0, SUFFIXSW) \
 131     X("version", 0, VERSIONSW) \
 132     X("help", 0, HELPSW)
 133 #else  /* ! HAVE_MKSTEMPS */
 134 #   define MHFIXMSG_SWITCHES \
 135     X("directory", 0, DIRECTORYSW) \
 136     X("prefix", 0, PREFIXSW) \
 137     X("version", 0, VERSIONSW) \
 138     X("help", 0, HELPSW)
 139 #endif /* ! HAVE_MKSTEMPS */
 140
 141 #define X(sw, minchars, id) id,
 142 DEFINE_SWITCH_ENUM(MHFIXMSG);
 143 #undef X
 144
 145 #define X(sw, minchars, id) { sw, minchars, id },
 146 DEFINE_SWITCH_ARRAY(MHFIXMSG, switches);
 147 #undef X
 148
 149 static void
 150 process_args(int argc, char **argv, const char **directory,
 151              const char **prefix, const char **suffix)
 152 {
 153     char **argp, **arguments, *cp, buf[100];
 154 #   if ! HAVE_MKSTEMPS
 155     NMH_UNUSED(suffix);
 156 #   endif /* ! HAVE_MKSTEMPS */
 157
 158     if (nmh_init(argv[0], true, false)) { done(1); }
 159     arguments = getarguments (invo_name, argc, argv, 1);
 160     argp = arguments;
 161
 162     /*
 163      * Parse arguments
 164      */
 165     while ((cp = *argp++)) {
 166         if (*cp == '-') {
 167             switch (smatch(++cp, switches)) {
 168             case AMBIGSW:
 169                 ambigsw(cp, switches);
 170                 done(1);
 171             case UNKWNSW:
 172                 inform("-%s unknown", cp);
 173                 (void) snprintf(buf, sizeof buf, "%s [switches]", invo_name);
 174                 print_help(buf, switches, 1);
 175                 done(1);
 176             case HELPSW:
 177                 (void) snprintf(buf, sizeof buf, "%s [switches]", invo_name);
 178                 print_help(buf, switches, 1);
 179                 done(OK);
 180             case VERSIONSW:
 181                 print_version(invo_name);
 182                 done(OK);
 183
 184             case DIRECTORYSW:
 185                 /* Allow the directory to start with '-'. */
 186                 if ((cp = *argp++) == NULL) {
 187                     die("missing argument to %s", argp[-2]);
 188                 }
 189                 *directory = cp;
 190                 continue;
 191
 192             case PREFIXSW:
 193                 /* Allow the prefix to start with '-'. */
 194                 if ((cp = *argp++) == NULL) {
 195                     die("missing argument to %s", argp[-2]);
 196                 }
 197                 *prefix = cp;
 198                 continue;
 199
 200 #           if HAVE_MKSTEMPS
 201             case SUFFIXSW:
 202                 /* Allow the suffix to start with '-'. */
 203                 if ((cp = *argp++) == NULL) {
 204                     die("missing argument to %s", argp[-2]);
 205                 }
 206                 *suffix = cp;
 207                 continue;
 208 #           endif /* HAVE_MKSTEMPS */
 209             }
 210         }
 211     }
 212 }
 213 #else  /* ! NMH */
 214 static void
 215 process_args(int argc, char **argv, const char **directory,
 216              const char **prefix, const char **suffix)
 217 {
 218 #   if HAVE_MKSTEMPS
 219     const char usage[] =
 220         "usage: %s [-h] [-d directory] [-p prefix] [-s suffix]\n";
 221     const char optstring[] = "d:hp:s:";
 222 #   else  /* ! HAVE_MKSTEMPS */
 223     const char usage[] = "usage: %s [-h] [-d directory] [-p prefix]\n";
 224     const char optstring[] = "d:hp:";
 225 #   endif /* ! HAVE_MKSTEMPS */
 226     int opt;
 227
 228     while ((opt = getopt(argc, argv, optstring)) != -1) {
 229         switch (opt) {
 230         case 'd':
 231             *directory = optarg;
 232             break;
 233         case 'p':
 234             *prefix = optarg;
 235             break;
 236         case 's':
 237             *suffix = optarg;
 238             break;
 239         case 'h':
 240             (void) printf(usage, argv[0]);
 241             exit(0);
 242         default:
 243             (void) fprintf(stderr, usage, argv[0]);
 244             exit(1);
 245         }
 246     }
 247 }
 248 #endif /* ! NMH */