112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/* Originally released by the musl project (http://www.musl-libc.org/) under the
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* MIT license. Taken and adapted from the file src/stdlib/atoi.c
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "parse_num.h"
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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size_t
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parseUInt64(const char *str, size_t size, uint64_t *result) {
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size_t i = 0;
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uint64_t n = 0, prev = 0;
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/* Hex */
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if(size > 2 && str[0] == '0' && (str[1] | 32) == 'x') {
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i = 2;
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for(; i < size; i++) {
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uint8_t c = (uint8_t)str[i] | 32;
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if(c >= '0' && c <= '9')
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c = (uint8_t)(c - '0');
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else if(c >= 'a' && c <='f')
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c = (uint8_t)(c - 'a' + 10);
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else if(c >= 'A' && c <='F')
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c = (uint8_t)(c - 'A' + 10);
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else
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break;
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n = (n << 4) | (c & 0xF);
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if(n < prev) /* Check for overflow */
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return 0;
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prev = n;
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}
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*result = n;
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return (i > 2) ? i : 0; /* 2 -> No digit was parsed */
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}
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/* Decimal */
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for(; i < size; i++) {
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if(str[i] < '0' || str[i] > '9')
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break;
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/* Fast multiplication: n*10 == (n*8) + (n*2) */
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n = (n << 3) + (n << 1) + (uint8_t)(str[i] - '0');
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if(n < prev) /* Check for overflow */
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return 0;
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prev = n;
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}
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*result = n;
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return i;
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}
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size_t
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parseInt64(const char *str, size_t size, int64_t *result) {
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/* Negative value? */
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size_t i = 0;
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bool neg = false;
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if(*str == '-' || *str == '+') {
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neg = (*str == '-');
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i++;
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}
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/* Parse as unsigned */
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uint64_t n = 0;
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size_t len = parseUInt64(&str[i], size - i, &n);
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if(len == 0)
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return 0;
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/* Check for overflow, adjust and return */
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if(!neg) {
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if(n > 9223372036854775807UL)
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return 0;
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*result = (int64_t)n;
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} else {
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if(n > 9223372036854775808UL)
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return 0;
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*result = -(int64_t)n;
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}
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return len + i;
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}
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size_t parseDouble(const char *str, size_t size, double *result) {
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char buf[2000];
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if(size >= 2000)
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return 0;
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memcpy(buf, str, size);
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buf[size] = 0;
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errno = 0;
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char *endptr;
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*result = strtod(str, &endptr);
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if(errno != 0 && errno != ERANGE)
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return 0;
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return (uintptr_t)endptr - (uintptr_t)str;
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}
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