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
   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             snprintf(option_text, 37, "-%s%s, --%s%s",
 124                      def->short_name, short_val,
 125                      def->long_name, long_val);
 126         else if (def->short_name)
 127             snprintf(option_text, 37, "-%s%s",
 128                      def->short_name, short_val);
 129         else if (def->long_name)
 130             snprintf(option_text, 37, "          --%s%s",
 131                      def->long_name, long_val);
 132
 133         fprintf(fp, "  %-37s\t%s\n", option_text, def->desc);
 134     }
 135 }
 136
 137
 138 unsigned int arg_parse_uint(const struct arg *arg)
 139 {
 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     {
 147         if (rawval >= 0 && rawval <= UINT_MAX)
 148             return rawval;
 149
 150         die("Option %s: Value %ld out of range for unsigned int\n",
 151             arg->name, rawval);
 152     }
 153
 154     die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 155     return 0;
 156 }
 157
 158
 159 int arg_parse_int(const struct arg *arg)
 160 {
 161     long int   rawval;
 162     char      *endptr;
 163
 164     rawval = strtol(arg->val, &endptr, 10);
 165
 166     if (arg->val[0] != '\0' && endptr[0] == '\0')
 167     {
 168         if (rawval >= INT_MIN && rawval <= INT_MAX)
 169             return rawval;
 170
 171         die("Option %s: Value %ld out of range for signed int\n",
 172             arg->name, rawval);
 173     }
 174
 175     die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 176     return 0;
 177 }
 178
 179
 180 struct vpx_rational
 181 {
 182     int num; /**< fraction numerator */
 183     int den; /**< fraction denominator */
 184 };
 185 struct vpx_rational arg_parse_rational(const struct arg *arg)
 186 {
 187     long int             rawval;
 188     char                *endptr;
 189     struct vpx_rational  rat;
 190
 191     /* parse numerator */
 192     rawval = strtol(arg->val, &endptr, 10);
 193
 194     if (arg->val[0] != '\0' && endptr[0] == '/')
 195     {
 196         if (rawval >= INT_MIN && rawval <= INT_MAX)
 197             rat.num = rawval;
 198         else die("Option %s: Value %ld out of range for signed int\n",
 199                      arg->name, rawval);
 200     }
 201     else die("Option %s: Expected / at '%c'\n", arg->name, *endptr);
 202
 203     /* parse denominator */
 204     rawval = strtol(endptr + 1, &endptr, 10);
 205
 206     if (arg->val[0] != '\0' && endptr[0] == '\0')
 207     {
 208         if (rawval >= INT_MIN && rawval <= INT_MAX)
 209             rat.den = rawval;
 210         else die("Option %s: Value %ld out of range for signed int\n",
 211                      arg->name, rawval);
 212     }
 213     else die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 214
 215     return rat;
 216 }