/**
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* \file
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* Parsing for GC options.
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*
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* Copyright (C) 2015 Xamarin Inc
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*
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* Licensed under the MIT license. See LICENSE file in the project root for full license information.
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*/
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#include <config.h>
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#include <glib.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include "parse.h"
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/**
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* mono_gc_parse_environment_string_extract_number:
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* \param str points to the first digit of the number
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* \param out pointer to the variable that will receive the value
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* Tries to extract a number from the passed string, taking in to account m, k
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* and g suffixes
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* \returns TRUE if passing was successful
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*/
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gboolean
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mono_gc_parse_environment_string_extract_number (const char *str, size_t *out)
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{
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char *endptr;
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int len = strlen (str), shift = 0;
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size_t val;
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gboolean is_suffix = FALSE;
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char suffix;
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if (!len)
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return FALSE;
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suffix = str [len - 1];
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switch (suffix) {
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case 'g':
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case 'G':
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shift += 10;
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case 'm':
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case 'M':
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shift += 10;
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case 'k':
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case 'K':
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shift += 10;
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is_suffix = TRUE;
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break;
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default:
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if (!isdigit (suffix))
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return FALSE;
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break;
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}
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errno = 0;
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val = strtol (str, &endptr, 10);
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if ((errno == ERANGE && (val == LONG_MAX || val == LONG_MIN))
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|| (errno != 0 && val == 0) || (endptr == str))
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return FALSE;
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if (is_suffix) {
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size_t unshifted;
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if (*(endptr + 1)) /* Invalid string. */
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return FALSE;
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unshifted = (size_t)val;
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val <<= shift;
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if (((size_t)val >> shift) != unshifted) /* value too large */
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return FALSE;
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}
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*out = val;
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return TRUE;
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}
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