args.c 5.3 KB
Newer Older
John Koleszar's avatar
John Koleszar committed
1 2 3
/*
 *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
 *
4 5 6 7 8
 *  Use of this source code is governed by a BSD-style license 
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may 
 *  be found in the AUTHORS file in the root of the source tree.
John Koleszar's avatar
John Koleszar committed
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216
 */


#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "args.h"

#ifdef _MSC_VER
#define snprintf _snprintf
#endif

#if defined(__GNUC__) && __GNUC__
extern void die(const char *fmt, ...) __attribute__((noreturn));
#else
extern void die(const char *fmt, ...);
#endif


struct arg arg_init(char **argv)
{
    struct arg a;

    a.argv      = argv;
    a.argv_step = 1;
    a.name      = NULL;
    a.val       = NULL;
    a.def       = NULL;
    return a;
}

int arg_match(struct arg *arg_, const struct arg_def *def, char **argv)
{
    struct arg arg;

    if (!argv[0] || argv[0][0] != '-')
        return 0;

    arg = arg_init(argv);

    if (def->short_name
        && strlen(arg.argv[0]) == strlen(def->short_name) + 1
        && !strcmp(arg.argv[0] + 1, def->short_name))
    {

        arg.name = arg.argv[0] + 1;
        arg.val = def->has_val ? arg.argv[1] : NULL;
        arg.argv_step = def->has_val ? 2 : 1;
    }
    else if (def->long_name)
    {
        int name_len = strlen(def->long_name);

        if (strlen(arg.argv[0]) >= name_len + 2
            && arg.argv[0][1] == '-'
            && !strncmp(arg.argv[0] + 2, def->long_name, name_len)
            && (arg.argv[0][name_len+2] == '='
                || arg.argv[0][name_len+2] == '\0'))
        {

            arg.name = arg.argv[0] + 2;
            arg.val = arg.name[name_len] == '=' ? arg.name + name_len + 1 : NULL;
            arg.argv_step = 1;
        }
    }

    if (arg.name && !arg.val && def->has_val)
        die("Error: option %s requires argument.\n", arg.name);

    if (arg.name && arg.val && !def->has_val)
        die("Error: option %s requires no argument.\n", arg.name);

    if (arg.name
        && (arg.val || !def->has_val))
    {
        arg.def = def;
        *arg_ = arg;
        return 1;
    }

    return 0;
}


const char *arg_next(struct arg *arg)
{
    if (arg->argv[0])
        arg->argv += arg->argv_step;

    return *arg->argv;
}


char **argv_dup(int argc, const char **argv)
{
    char **new_argv = malloc((argc + 1) * sizeof(*argv));

    memcpy(new_argv, argv, argc * sizeof(*argv));
    new_argv[argc] = NULL;
    return new_argv;
}


void arg_show_usage(FILE *fp, const struct arg_def *const *defs)
{
    char option_text[40] = {0};

    for (; *defs; defs++)
    {
        const struct arg_def *def = *defs;
        char *short_val = def->has_val ? " <arg>" : "";
        char *long_val = def->has_val ? "=<arg>" : "";

        if (def->short_name && def->long_name)
            snprintf(option_text, 37, "-%s%s, --%s%s",
                     def->short_name, short_val,
                     def->long_name, long_val);
        else if (def->short_name)
            snprintf(option_text, 37, "-%s%s",
                     def->short_name, short_val);
        else if (def->long_name)
            snprintf(option_text, 37, "          --%s%s",
                     def->long_name, long_val);

        fprintf(fp, "  %-37s\t%s\n", option_text, def->desc);
    }
}


unsigned int arg_parse_uint(const struct arg *arg)
{
    long int   rawval;
    char      *endptr;

    rawval = strtol(arg->val, &endptr, 10);

    if (arg->val[0] != '\0' && endptr[0] == '\0')
    {
        if (rawval >= 0 && rawval <= UINT_MAX)
            return rawval;

        die("Option %s: Value %ld out of range for unsigned int\n",
            arg->name, rawval);
    }

    die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
    return 0;
}


int arg_parse_int(const struct arg *arg)
{
    long int   rawval;
    char      *endptr;

    rawval = strtol(arg->val, &endptr, 10);

    if (arg->val[0] != '\0' && endptr[0] == '\0')
    {
        if (rawval >= INT_MIN && rawval <= INT_MAX)
            return rawval;

        die("Option %s: Value %ld out of range for signed int\n",
            arg->name, rawval);
    }

    die("Option %s: Invalid character '%c'\n", arg->name, *endptr);
    return 0;
}


struct vpx_rational
{
    int num; /**< fraction numerator */
    int den; /**< fraction denominator */
};
struct vpx_rational arg_parse_rational(const struct arg *arg)
{
    long int             rawval;
    char                *endptr;
    struct vpx_rational  rat;

    /* parse numerator */
    rawval = strtol(arg->val, &endptr, 10);

    if (arg->val[0] != '\0' && endptr[0] == '/')
    {
        if (rawval >= INT_MIN && rawval <= INT_MAX)
            rat.num = rawval;
        else die("Option %s: Value %ld out of range for signed int\n",
                     arg->name, rawval);
    }
    else die("Option %s: Expected / at '%c'\n", arg->name, *endptr);

    /* parse denominator */
    rawval = strtol(endptr + 1, &endptr, 10);

    if (arg->val[0] != '\0' && endptr[0] == '\0')
    {
        if (rawval >= INT_MIN && rawval <= INT_MAX)
            rat.den = rawval;
        else die("Option %s: Value %ld out of range for signed int\n",
                     arg->name, rawval);
    }
    else die("Option %s: Invalid character '%c'\n", arg->name, *endptr);

    return rat;
}