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81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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///////////////////////////////////////
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// Implements:
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// long int strtol(const char *nptr, char **endptr, int base);
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#include <ctype.h>
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#include <string.h>
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#include <stdint.h>
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#include <limits.h>
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#include <stdbool.h>
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intmax_t strtoX_core(const char * restrict nptr, char ** restrict endptr, int base, bool do_errors,
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intmax_t max, intmax_t min) {
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intmax_t value = 0;
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int sign = 1;
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while (isspace((int)*nptr)) {
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nptr++;
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}
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switch (*nptr) {
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case '+': sign = 1; nptr++; break;
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case '-': sign = -1; nptr++; break;
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}
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if (nptr[0] == '0' && nptr[1] == 'x' && (base == 0 || base == 16)) {
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base = 16;
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nptr += 2;
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} else if (nptr[0] == '0' && (base == 0 || base == 8)) {
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base = 8;
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nptr++;
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} else if (base == 0) {
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base = 10;
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}
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// We break on '\0' anyways
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for (;;) {
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char ch = *nptr;
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if (ch >= '0' && ch <= '9') {
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ch = ch - '0';
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} else if (ch >= 'A' && ch <= 'Z') {
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ch = ch - 'A' + 10;
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} else if (ch >= 'a' && ch <= 'z') {
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ch = ch - 'a' + 10;
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} else { // This will catch '\0'
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break;
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}
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if (ch >= base) {
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break;
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}
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value *= base;
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value += ch;
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if (do_errors) {
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if ((sign > 0) && (value > max)) {
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value = max;
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} else if ((sign < 0) && (-value < min)) {
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value = -min;
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}
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}
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nptr++;
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}
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if (endptr) {
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*endptr = (char*)nptr;
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}
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return value * sign;
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}
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long int strtol(const char * restrict nptr, char ** restrict endptr, int base) {
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return strtoX_core(nptr, endptr, base, true, INT_MAX, INT_MIN);
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}
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