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Diffstat (limited to '')
| -rw-r--r-- | include/stdlib.h | 57 | ||||
| -rw-r--r-- | src/stdlib/atoi.c | 116 |
2 files changed, 173 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h index eca92b2..4aa95f2 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -133,6 +133,63 @@ char* relpath(const char*, const char*) #endif +/** + * Convert a string to an integer, + * without checking for errors. + * + * Note that, the behaviour is unspecified + * if the string contains anything else than + * digits and either a leading '-' (hyphen) + * or a leading plus. + * + * @param string The string to convert. + * @return The integer encoded by the string. + */ +int atoi(const char*) + __GCC_ONLY(__attribute__((warn_unused_result, nonnull, pure))); + +/** + * Convert a string to an integer, + * without checking for errors. + * + * Note that, the behaviour is unspecified + * if the string contains anything else than + * digits and either a leading '-' (hyphen) + * or a leading plus. + * + * @param string The string to convert. + * @return The integer encoded by the string. + */ +long int atol(const char*) + __GCC_ONLY(__attribute__((warn_unused_result, nonnull, pure))); + +/** + * Convert a string to an integer, + * without checking for errors. + * + * Note that, the behaviour is unspecified + * if the string contains anything else than + * digits and either a leading '-' (hyphen) + * or a leading plus. + * + * @param string The string to convert. + * @return The integer encoded by the string. + */ +long long int atoll(const char*) + __GCC_ONLY(__attribute__((warn_unused_result, nonnull, pure))); + +#if !defined(__PORTABLE) +/** + * This function is identical to `atoll`. + * + * This is a Linux libc extension. + */ +long long int atoq(const char*) + __deprecated("'atoq' is obsolete and not portable, use 'atoll' instead.") + __GCC_ONLY(__attribute__((warn_unused_result, nonnull, pure))); +#endif + + /* TODO implement rand-functions */ #define RAND_MAX 1 diff --git a/src/stdlib/atoi.c b/src/stdlib/atoi.c new file mode 100644 index 0000000..bbb87c3 --- /dev/null +++ b/src/stdlib/atoi.c @@ -0,0 +1,116 @@ +/** + * slibc — Yet another C library + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <stdlib.h> +#include <ctype.h> + + + +/** + * Convert a string to an integer, + * without checking for errors. + * + * Note that, the behaviour is unspecified + * if the string contains anything else than + * digits and either a leading '-' (hyphen) + * or a leading plus. + * + * @param string The string to convert. + * @return The integer encoded by the string. + */ +int atoi(const char* string) +{ + return (int)atol(string); +} + + +/** + * Convert a string to an integer, + * without checking for errors. + * + * Note that, the behaviour is unspecified + * if the string contains anything else than + * digits and either a leading '-' (hyphen) + * or a leading plus. + * + * @param string The string to convert. + * @return The integer encoded by the string. + */ +long int atol(const char* string) +{ + long int rc; + int neg = 0; + + while (isspace(*string)) + string++; + + switch (*string) + { + case '-': neg = 1; + case '+': string++; + } + + while (isdigit(*string)) + n = n * 10 - (*string++ & 15); + + return neg ? rc : -rc; +} + + +/** + * Convert a string to an integer, + * without checking for errors. + * + * Note that, the behaviour is unspecified + * if the string contains anything else than + * digits and either a leading '-' (hyphen) + * or a leading plus. + * + * @param string The string to convert. + * @return The integer encoded by the string. + */ +long long int atoll(const char* string) +{ + long long int rc; + int neg = 0; + + while (isspace(*string)) + string++; + + switch (*string) + { + case '-': neg = 1; + case '+': string++; + } + + while (isdigit(*string)) + n = n * 10 - (*string++ & 15); + + return neg ? rc : -rc; +} + + +/** + * This function is identical to `atoll`. + * + * This is a Linux libc extension. + */ +long long int atoq(const char* string) +{ + return atoll(string); +} + |