args.c

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <limits.h>
  15 #include "args.h"
  16
  17 #ifdef _MSC_VER
  18 #define snprintf _snprintf
  19 #endif
  20
  21 #if defined(__GNUC__) && __GNUC__
  22 extern void die(const char *fmt, ...) __attribute__((noreturn));
  23 #else
  24 extern void die(const char *fmt, ...);
  25 #endif
  26
  27
  28 struct arg arg_init(char **argv) {
  29   struct arg a;
  30
  31   a.argv      = argv;
  32   a.argv_step = 1;
  33   a.name      = NULL;
  34   a.val       = NULL;
  35   a.def       = NULL;
  36   return a;
  37 }
  38
  39 int arg_match(struct arg *arg_, const struct arg_def *def, char **argv) {
  40   struct arg arg;
  41
  42   if (!argv[0] || argv[0][0] != '-')
  43     return 0;
  44
  45   arg = arg_init(argv);
  46
  47   if (def->short_name
  48       && strlen(arg.argv[0]) == strlen(def->short_name) + 1
  49       && !strcmp(arg.argv[0] + 1, def->short_name)) {
  50
  51     arg.name = arg.argv[0] + 1;
  52     arg.val = def->has_val ? arg.argv[1] : NULL;
  53     arg.argv_step = def->has_val ? 2 : 1;
  54   } else if (def->long_name) {
  55     const size_t name_len = strlen(def->long_name);
  56
  57     if (strlen(arg.argv[0]) >= name_len + 2
  58         && arg.argv[0][1] == '-'
  59         && !strncmp(arg.argv[0] + 2, def->long_name, name_len)
  60         && (arg.argv[0][name_len + 2] == '='
  61             || arg.argv[0][name_len + 2] == '\0')) {
  62
  63       arg.name = arg.argv[0] + 2;
  64       arg.val = arg.name[name_len] == '=' ? arg.name + name_len + 1 : NULL;
  65       arg.argv_step = 1;
  66     }
  67   }
  68
  69   if (arg.name && !arg.val && def->has_val)
  70     die("Error: option %s requires argument.\n", arg.name);
  71
  72   if (arg.name && arg.val && !def->has_val)
  73     die("Error: option %s requires no argument.\n", arg.name);
  74
  75   if (arg.name
  76       && (arg.val || !def->has_val)) {
  77     arg.def = def;
  78     *arg_ = arg;
  79     return 1;
  80   }
  81
  82   return 0;
  83 }
  84
  85
  86 const char *arg_next(struct arg *arg) {
  87   if (arg->argv[0])
  88     arg->argv += arg->argv_step;
  89
  90   return *arg->argv;
  91 }
  92
  93
  94 char **argv_dup(int argc, const char **argv) {
  95   char **new_argv = malloc((argc + 1) * sizeof(*argv));
  96
  97   memcpy(new_argv, argv, argc * sizeof(*argv));
  98   new_argv[argc] = NULL;
  99   return new_argv;
 100 }
 101
 102
 103 void arg_show_usage(FILE *fp, const struct arg_def *const *defs) {
 104   char option_text[40] = {0};
 105
 106   for (; *defs; defs++) {
 107     const struct arg_def *def = *defs;
 108     char *short_val = def->has_val ? " <arg>" : "";
 109     char *long_val = def->has_val ? "=<arg>" : "";
 110
 111     if (def->short_name && def->long_name) {
 112       char *comma = def->has_val ? "," : ",      ";
 113
 114       snprintf(option_text, 37, "-%s%s%s --%s%6s",
 115                def->short_name, short_val, comma,
 116                def->long_name, long_val);
 117     } else if (def->short_name)
 118       snprintf(option_text, 37, "-%s%s",
 119                def->short_name, short_val);
 120     else if (def->long_name)
 121       snprintf(option_text, 37, "          --%s%s",
 122                def->long_name, long_val);
 123
 124     fprintf(fp, "  %-37s\t%s\n", option_text, def->desc);
 125
 126     if (def->enums) {
 127       const struct arg_enum_list *listptr;
 128
 129       fprintf(fp, "  %-37s\t  ", "");
 130
 131       for (listptr = def->enums; listptr->name; listptr++)
 132         fprintf(fp, "%s%s", listptr->name,
 133                 listptr[1].name ? ", " : "\n");
 134     }
 135   }
 136 }
 137
 138
 139 unsigned int arg_parse_uint(const struct arg *arg) {
 140   long int   rawval;
 141   char      *endptr;
 142
 143   rawval = strtol(arg->val, &endptr, 10);
 144
 145   if (arg->val[0] != '\0' && endptr[0] == '\0') {
 146     if (rawval >= 0 && rawval <= UINT_MAX)
 147       return rawval;
 148
 149     die("Option %s: Value %ld out of range for unsigned int\n",
 150         arg->name, rawval);
 151   }
 152
 153   die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 154   return 0;
 155 }
 156
 157
 158 int arg_parse_int(const struct arg *arg) {
 159   long int   rawval;
 160   char      *endptr;
 161
 162   rawval = strtol(arg->val, &endptr, 10);
 163
 164   if (arg->val[0] != '\0' && endptr[0] == '\0') {
 165     if (rawval >= INT_MIN && rawval <= INT_MAX)
 166       return rawval;
 167
 168     die("Option %s: Value %ld out of range for signed int\n",
 169         arg->name, rawval);
 170   }
 171
 172   die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 173   return 0;
 174 }
 175
 176
 177 struct vpx_rational {
 178   int num; /**< fraction numerator */
 179   int den; /**< fraction denominator */
 180 };
 181 struct vpx_rational arg_parse_rational(const struct arg *arg) {
 182   long int             rawval;
 183   char                *endptr;
 184   struct vpx_rational  rat;
 185
 186   /* parse numerator */
 187   rawval = strtol(arg->val, &endptr, 10);
 188
 189   if (arg->val[0] != '\0' && endptr[0] == '/') {
 190     if (rawval >= INT_MIN && rawval <= INT_MAX)
 191       rat.num = rawval;
 192     else die("Option %s: Value %ld out of range for signed int\n",
 193                arg->name, rawval);
 194   } else die("Option %s: Expected / at '%c'\n", arg->name, *endptr);
 195
 196   /* parse denominator */
 197   rawval = strtol(endptr + 1, &endptr, 10);
 198
 199   if (arg->val[0] != '\0' && endptr[0] == '\0') {
 200     if (rawval >= INT_MIN && rawval <= INT_MAX)
 201       rat.den = rawval;
 202     else die("Option %s: Value %ld out of range for signed int\n",
 203                arg->name, rawval);
 204   } else die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 205
 206   return rat;
 207 }
 208
 209
 210 int arg_parse_enum(const struct arg *arg) {
 211   const struct arg_enum_list *listptr;
 212   long int                    rawval;
 213   char                       *endptr;
 214
 215   /* First see if the value can be parsed as a raw value */
 216   rawval = strtol(arg->val, &endptr, 10);
 217   if (arg->val[0] != '\0' && endptr[0] == '\0') {
 218     /* Got a raw value, make sure it's valid */
 219     for (listptr = arg->def->enums; listptr->name; listptr++)
 220       if (listptr->val == rawval)
 221         return rawval;
 222   }
 223
 224   /* Next see if it can be parsed as a string */
 225   for (listptr = arg->def->enums; listptr->name; listptr++)
 226     if (!strcmp(arg->val, listptr->name))
 227       return listptr->val;
 228
 229   die("Option %s: Invalid value '%s'\n", arg->name, arg->val);
 230   return 0;
 231 }
 232
 233
 234 int arg_parse_enum_or_int(const struct arg *arg) {
 235   if (arg->def->enums)
 236     return arg_parse_enum(arg);
 237   return arg_parse_int(arg);
 238 }