From 41f350e672007ee64657b4ac67ffc95229ad841d Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sat, 10 Oct 2015 21:48:37 +0200 Subject: add abs, labs, llabs, and imaxabs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- include/inttypes.h | 14 +++++++++++ include/stdlib.h | 43 +++++++++++++++++++++++++++++++++ src/inttypes/abs.c | 37 ++++++++++++++++++++++++++++ src/stdlib/abs.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 165 insertions(+) create mode 100644 src/inttypes/abs.c create mode 100644 src/stdlib/abs.c diff --git a/include/inttypes.h b/include/inttypes.h index 3f24e9b..4530fef 100644 --- a/include/inttypes.h +++ b/include/inttypes.h @@ -40,6 +40,20 @@ imaxdiv_t imaxdiv(intmax_t, intmax_t) __GCC_ONLY(__attribute__((const))); +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `INTMAX_MIN` and + * `-INTMAX_MAX != -INTMAX_MIN`, the result will + * overflow, and `INTMAX_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +intmax_t imaxabs(intmax_t) + __GCC_ONLY(__attribute__((const))); + #endif diff --git a/include/stdlib.h b/include/stdlib.h index 8d65597..4fba1a0 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -93,6 +93,49 @@ lldiv_t lldiv(long long, long long) __GCC_ONLY(__attribute__((const))); +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `INT_MIN` and + * `-INT_MAX != -INT_MIN`, the result will + * overflow, and `INT_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +int abs(int) + __GCC_ONLY(__attribute__((const))); + +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `LONG_MIN` and + * `-LONG_MAX != -LONG_MIN`, the result will + * overflow, and `LONG_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +long int labs(long int) + __GCC_ONLY(__attribute__((const))); + +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `LLONG_MIN` and + * `-LLONG_MAX != -LLONG_MIN`, the result will + * overflow, and `LLONG_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +long long int llabs(long long int) + __GCC_ONLY(__attribute__((const))); + + #if !defined(__PORTABLE) /** * Get the absolute path of a file. diff --git a/src/inttypes/abs.c b/src/inttypes/abs.c new file mode 100644 index 0000000..1f3b337 --- /dev/null +++ b/src/inttypes/abs.c @@ -0,0 +1,37 @@ +/** + * 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 . + */ +#include + + + +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `INTMAX_MIN` and + * `-INTMAX_MAX != -INTMAX_MIN`, the result will + * overflow, and `INTMAX_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +intmax_t imaxabs(intmax_t value) +{ + return value < 0 ? -value : value; +} + diff --git a/src/stdlib/abs.c b/src/stdlib/abs.c new file mode 100644 index 0000000..13e545e --- /dev/null +++ b/src/stdlib/abs.c @@ -0,0 +1,71 @@ +/** + * 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 . + */ +#include + + + +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `INT_MIN` and + * `-INT_MAX != -INT_MIN`, the result will + * overflow, and `INT_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +int abs(int value) +{ + return value < 0 ? -value : value; +} + + +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `LONG_MIN` and + * `-LONG_MAX != -LONG_MIN`, the result will + * overflow, and `LONG_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +long int labs(long int value) +{ + return value < 0 ? -value : value; +} + + +/** + * Return the absolute value of an integer. + * + * Be aware, if the value is `LLONG_MIN` and + * `-LLONG_MAX != -LLONG_MIN`, the result will + * overflow, and `LLONG_MIN` will (probably) + * be returned. + * + * @param value The integer. + * @return The absolute value of the integer. + */ +long long int llabs(long long int value) +{ + return value < 0 ? -value : value; +} + -- cgit v1.2.3-70-g09d2