tor-browser

args_helper.c (6470B)

---

/*
* Copyright (c) 2020, Alliance for Open Media. All rights reserved.
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include "common/args_helper.h"

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#define SET_ERR_STRING(...) \
 if (err_msg) snprintf(err_msg, ARG_ERR_MSG_MAX_LEN, __VA_ARGS__)

static 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_helper(struct arg *arg_, const struct arg_def *def, char **argv,
                    char *err_msg) {
 struct arg arg;

 if (err_msg) err_msg[0] = '\0';

 assert(def->has_val == 0 || def->has_val == 1 || def->has_val == -1);

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

 arg = arg_init(argv);

 if (def->short_name && !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) {
   const size_t name_len = strlen(def->long_name);

   if (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) {
   if (def->has_val == -1) {
     arg.def = def;
     *arg_ = arg;
     return 1;
   }

   if (!arg.val && def->has_val) {
     SET_ERR_STRING("Error: option %s requires argument.\n", arg.name);
     return 0;
   }

   if (arg.val && !def->has_val) {
     SET_ERR_STRING("Error: option %s requires no argument.\n", arg.name);
     return 0;
   }

   arg.def = def;
   *arg_ = arg;
   return 1;
 }

 return 0;
}

unsigned int arg_parse_uint_helper(const struct arg *arg, char *err_msg) {
 char *endptr;
 const unsigned long rawval = strtoul(arg->val, &endptr, 10);  // NOLINT

 if (err_msg) err_msg[0] = '\0';

 if (arg->val[0] != '\0' && endptr[0] == '\0') {
   if (rawval <= UINT_MAX) return (unsigned int)rawval;
   SET_ERR_STRING("Option %s: Value %lu out of range for unsigned int\n",
                  arg->name, rawval);
   return 0;
 }
 SET_ERR_STRING("Option %s: Invalid character '%c'\n", arg->name, *endptr);
 return 0;
}

int arg_parse_int_helper(const struct arg *arg, char *err_msg) {
 char *endptr;
 const long rawval = strtol(arg->val, &endptr, 10);  // NOLINT

 if (err_msg) err_msg[0] = '\0';

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

struct aom_rational arg_parse_rational_helper(const struct arg *arg,
                                             char *err_msg) {
 long rawval;  // NOLINT
 char *endptr;
 struct aom_rational rat = { 0, 1 };

 if (err_msg) err_msg[0] = '\0';

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

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

 /* 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 = (int)rawval;
   } else {
     SET_ERR_STRING("Option %s: Value %ld out of range for signed int\n",
                    arg->name, rawval);
     return rat;
   }
 } else {
   SET_ERR_STRING("Option %s: Invalid character '%c'\n", arg->name, *endptr);
   return rat;
 }

 return rat;
}

int arg_parse_enum_helper(const struct arg *arg, char *err_msg) {
 const struct arg_enum_list *listptr;
 long rawval;  // NOLINT
 char *endptr;

 if (err_msg) err_msg[0] = '\0';

 /* First see if the value can be parsed as a raw value */
 rawval = strtol(arg->val, &endptr, 10);
 if (arg->val[0] != '\0' && endptr[0] == '\0') {
   /* Got a raw value, make sure it's valid */
   for (listptr = arg->def->enums; listptr->name; listptr++)
     if (listptr->val == rawval) return (int)rawval;
 }

 /* Next see if it can be parsed as a string */
 for (listptr = arg->def->enums; listptr->name; listptr++)
   if (!strcmp(arg->val, listptr->name)) return listptr->val;

 SET_ERR_STRING("Option %s: Invalid value '%s'\n", arg->name, arg->val);
 return 0;
}

int arg_parse_enum_or_int_helper(const struct arg *arg, char *err_msg) {
 if (arg->def->enums) return arg_parse_enum_helper(arg, err_msg);
 return arg_parse_int_helper(arg, err_msg);
}

// parse a comma separated list of at most n integers
// return the number of elements in the list
int arg_parse_list_helper(const struct arg *arg, int *list, int n,
                         char *err_msg) {
 const char *ptr = arg->val;
 char *endptr;
 int i = 0;

 if (err_msg) err_msg[0] = '\0';

 while (ptr[0] != '\0') {
   long rawval = strtol(ptr, &endptr, 10);  // NOLINT
   if (rawval < INT_MIN || rawval > INT_MAX) {
     SET_ERR_STRING("Option %s: Value %ld out of range for signed int\n",
                    arg->name, rawval);
     return 0;
   } else if (i >= n) {
     SET_ERR_STRING("Option %s: List has more than %d entries\n", arg->name,
                    n);
     return 0;
   } else if (*endptr == ',') {
     endptr++;
   } else if (*endptr != '\0') {
     SET_ERR_STRING("Option %s: Bad list separator '%c'\n", arg->name,
                    *endptr);
     return 0;
   }
   list[i++] = (int)rawval;
   ptr = endptr;
 }
 return i;
}