args.c

   1 /*
   2  *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license and patent
   5  *  grant that can be found in the LICENSE file in the root of the source
   6  *  tree. All contributing project authors may be found in the AUTHORS
   7  *  file in the root of the source tree.
   8  */
   9
  10
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <limits.h>
  14 #include "args.h"
  15
  16 #ifdef _MSC_VER
  17 #define snprintf _snprintf
  18 #endif
  19
  20 #if defined(__GNUC__) && __GNUC__
  21 extern void die(const char *fmt, ...) __attribute__((noreturn));
  22 #else
  23 extern void die(const char *fmt, ...);
  24 #endif
  25
  26
  27 struct arg arg_init(char **argv)
  28 {
  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 {
  41     struct arg arg;
  42
  43     if (!argv[0] || argv[0][0] != '-')
  44         return 0;
  45
  46     arg = arg_init(argv);
  47
  48     if (def->short_name
  49         && strlen(arg.argv[0]) == strlen(def->short_name) + 1
  50         && !strcmp(arg.argv[0] + 1, def->short_name))
  51     {
  52
  53         arg.name = arg.argv[0] + 1;
  54         arg.val = def->has_val ? arg.argv[1] : NULL;
  55         arg.argv_step = def->has_val ? 2 : 1;
  56     }
  57     else if (def->long_name)
  58     {
  59         int name_len = strlen(def->long_name);
  60
  61         if (strlen(arg.argv[0]) >= name_len + 2
  62             && arg.argv[0][1] == '-'
  63             && !strncmp(arg.argv[0] + 2, def->long_name, name_len)
  64             && (arg.argv[0][name_len+2] == '='
  65                 || arg.argv[0][name_len+2] == '\0'))
  66         {
  67
  68             arg.name = arg.argv[0] + 2;
  69             arg.val = arg.name[name_len] == '=' ? arg.name + name_len + 1 : NULL;
  70             arg.argv_step = 1;
  71         }
  72     }
  73
  74     if (arg.name && !arg.val && def->has_val)
  75         die("Error: option %s requires argument.\n", arg.name);
  76
  77     if (arg.name && arg.val && !def->has_val)
  78         die("Error: option %s requires no argument.\n", arg.name);
  79
  80     if (arg.name
  81         && (arg.val || !def->has_val))
  82     {
  83         arg.def = def;
  84         *arg_ = arg;
  85         return 1;
  86     }
  87
  88     return 0;
  89 }
  90
  91
  92 const char *arg_next(struct arg *arg)
  93 {
  94     if (arg->argv[0])
  95         arg->argv += arg->argv_step;
  96
  97     return *arg->argv;
  98 }
  99
 100
 101 char **argv_dup(int argc, const char **argv)
 102 {
 103     char **new_argv = malloc((argc + 1) * sizeof(*argv));
 104
 105     memcpy(new_argv, argv, argc * sizeof(*argv));
 106     new_argv[argc] = NULL;
 107     return new_argv;
 108 }
 109
 110
 111 void arg_show_usage(FILE *fp, const struct arg_def *const *defs)
 112 {
 113     char option_text[40] = {0};
 114
 115     for (; *defs; defs++)
 116     {
 117         const struct arg_def *def = *defs;
 118         char *short_val = def->has_val ? " <arg>" : "";
 119         char *long_val = def->has_val ? "=<arg>" : "";
 120
 121         if (def->short_name && def->long_name)
 122             snprintf(option_text, 37, "-%s%s, --%s%s",
 123                      def->short_name, short_val,
 124                      def->long_name, long_val);
 125         else if (def->short_name)
 126             snprintf(option_text, 37, "-%s%s",
 127                      def->short_name, short_val);
 128         else if (def->long_name)
 129             snprintf(option_text, 37, "          --%s%s",
 130                      def->long_name, long_val);
 131
 132         fprintf(fp, "  %-37s\t%s\n", option_text, def->desc);
 133     }
 134 }
 135
 136
 137 unsigned int arg_parse_uint(const struct arg *arg)
 138 {
 139     long int   rawval;
 140     char      *endptr;
 141
 142     rawval = strtol(arg->val, &endptr, 10);
 143
 144     if (arg->val[0] != '\0' && endptr[0] == '\0')
 145     {
 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 {
 160     long int   rawval;
 161     char      *endptr;
 162
 163     rawval = strtol(arg->val, &endptr, 10);
 164
 165     if (arg->val[0] != '\0' && endptr[0] == '\0')
 166     {
 167         if (rawval >= INT_MIN && rawval <= INT_MAX)
 168             return rawval;
 169
 170         die("Option %s: Value %ld out of range for signed int\n",
 171             arg->name, rawval);
 172     }
 173
 174     die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 175     return 0;
 176 }
 177
 178
 179 struct vpx_rational
 180 {
 181     int num; /**< fraction numerator */
 182     int den; /**< fraction denominator */
 183 };
 184 struct vpx_rational arg_parse_rational(const struct arg *arg)
 185 {
 186     long int             rawval;
 187     char                *endptr;
 188     struct vpx_rational  rat;
 189
 190     /* parse numerator */
 191     rawval = strtol(arg->val, &endptr, 10);
 192
 193     if (arg->val[0] != '\0' && endptr[0] == '/')
 194     {
 195         if (rawval >= INT_MIN && rawval <= INT_MAX)
 196             rat.num = rawval;
 197         else die("Option %s: Value %ld out of range for signed int\n",
 198                      arg->name, rawval);
 199     }
 200     else die("Option %s: Expected / at '%c'\n", arg->name, *endptr);
 201
 202     /* parse denominator */
 203     rawval = strtol(endptr + 1, &endptr, 10);
 204
 205     if (arg->val[0] != '\0' && endptr[0] == '\0')
 206     {
 207         if (rawval >= INT_MIN && rawval <= INT_MAX)
 208             rat.den = rawval;
 209         else die("Option %s: Value %ld out of range for signed int\n",
 210                      arg->name, rawval);
 211     }
 212     else die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 213
 214     return rat;
 215 }