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 {
  30     struct arg a;
  31
  32     a.argv      = argv;
  33     a.argv_step = 1;
  34     a.name      = NULL;
  35     a.val       = NULL;
  36     a.def       = NULL;
  37     return a;
  38 }
  39
  40 int arg_match(struct arg *arg_, const struct arg_def *def, char **argv)
  41 {
  42     struct arg arg;
  43
  44     if (!argv[0] || argv[0][0] != '-')
  45         return 0;
  46
  47     arg = arg_init(argv);
  48
  49     if (def->short_name
  50         && strlen(arg.argv[0]) == strlen(def->short_name) + 1
  51         && !strcmp(arg.argv[0] + 1, def->short_name))
  52     {
  53
  54         arg.name = arg.argv[0] + 1;
  55         arg.val = def->has_val ? arg.argv[1] : NULL;
  56         arg.argv_step = def->has_val ? 2 : 1;
  57     }
  58     else if (def->long_name)
  59     {
  60         int name_len = strlen(def->long_name);
  61
  62         if (strlen(arg.argv[0]) >= name_len + 2
  63             && arg.argv[0][1] == '-'
  64             && !strncmp(arg.argv[0] + 2, def->long_name, name_len)
  65             && (arg.argv[0][name_len+2] == '='
  66                 || arg.argv[0][name_len+2] == '\0'))
  67         {
  68
  69             arg.name = arg.argv[0] + 2;
  70             arg.val = arg.name[name_len] == '=' ? arg.name + name_len + 1 : NULL;
  71             arg.argv_step = 1;
  72         }
  73     }
  74
  75     if (arg.name && !arg.val && def->has_val)
  76         die("Error: option %s requires argument.\n", arg.name);
  77
  78     if (arg.name && arg.val && !def->has_val)
  79         die("Error: option %s requires no argument.\n", arg.name);
  80
  81     if (arg.name
  82         && (arg.val || !def->has_val))
  83     {
  84         arg.def = def;
  85         *arg_ = arg;
  86         return 1;
  87     }
  88
  89     return 0;
  90 }
  91
  92
  93 const char *arg_next(struct arg *arg)
  94 {
  95     if (arg->argv[0])
  96         arg->argv += arg->argv_step;
  97
  98     return *arg->argv;
  99 }
 100
 101
 102 char **argv_dup(int argc, const char **argv)
 103 {
 104     char **new_argv = malloc((argc + 1) * sizeof(*argv));
 105
 106     memcpy(new_argv, argv, argc * sizeof(*argv));
 107     new_argv[argc] = NULL;
 108     return new_argv;
 109 }
 110
 111
 112 void arg_show_usage(FILE *fp, const struct arg_def *const *defs)
 113 {
 114     char option_text[40] = {0};
 115
 116     for (; *defs; defs++)
 117     {
 118         const struct arg_def *def = *defs;
 119         char *short_val = def->has_val ? " <arg>" : "";
 120         char *long_val = def->has_val ? "=<arg>" : "";
 121
 122         if (def->short_name && def->long_name)
 123         {
 124             char *comma = def->has_val ? "," : ",      ";
 125
 126             snprintf(option_text, 37, "-%s%s%s --%s%6s",
 127                      def->short_name, short_val, comma,
 128                      def->long_name, long_val);
 129         }
 130         else if (def->short_name)
 131             snprintf(option_text, 37, "-%s%s",
 132                      def->short_name, short_val);
 133         else if (def->long_name)
 134             snprintf(option_text, 37, "          --%s%s",
 135                      def->long_name, long_val);
 136
 137         fprintf(fp, "  %-37s\t%s\n", option_text, def->desc);
 138     }
 139 }
 140
 141
 142 unsigned int arg_parse_uint(const struct arg *arg)
 143 {
 144     long int   rawval;
 145     char      *endptr;
 146
 147     rawval = strtol(arg->val, &endptr, 10);
 148
 149     if (arg->val[0] != '\0' && endptr[0] == '\0')
 150     {
 151         if (rawval >= 0 && rawval <= UINT_MAX)
 152             return rawval;
 153
 154         die("Option %s: Value %ld out of range for unsigned int\n",
 155             arg->name, rawval);
 156     }
 157
 158     die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 159     return 0;
 160 }
 161
 162
 163 int arg_parse_int(const struct arg *arg)
 164 {
 165     long int   rawval;
 166     char      *endptr;
 167
 168     rawval = strtol(arg->val, &endptr, 10);
 169
 170     if (arg->val[0] != '\0' && endptr[0] == '\0')
 171     {
 172         if (rawval >= INT_MIN && rawval <= INT_MAX)
 173             return rawval;
 174
 175         die("Option %s: Value %ld out of range for signed int\n",
 176             arg->name, rawval);
 177     }
 178
 179     die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 180     return 0;
 181 }
 182
 183
 184 struct vpx_rational
 185 {
 186     int num; /**< fraction numerator */
 187     int den; /**< fraction denominator */
 188 };
 189 struct vpx_rational arg_parse_rational(const struct arg *arg)
 190 {
 191     long int             rawval;
 192     char                *endptr;
 193     struct vpx_rational  rat;
 194
 195     /* parse numerator */
 196     rawval = strtol(arg->val, &endptr, 10);
 197
 198     if (arg->val[0] != '\0' && endptr[0] == '/')
 199     {
 200         if (rawval >= INT_MIN && rawval <= INT_MAX)
 201             rat.num = rawval;
 202         else die("Option %s: Value %ld out of range for signed int\n",
 203                      arg->name, rawval);
 204     }
 205     else die("Option %s: Expected / at '%c'\n", arg->name, *endptr);
 206
 207     /* parse denominator */
 208     rawval = strtol(endptr + 1, &endptr, 10);
 209
 210     if (arg->val[0] != '\0' && endptr[0] == '\0')
 211     {
 212         if (rawval >= INT_MIN && rawval <= INT_MAX)
 213             rat.den = rawval;
 214         else die("Option %s: Value %ld out of range for signed int\n",
 215                      arg->name, rawval);
 216     }
 217     else die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 218
 219     return rat;
 220 }