From 896026a8991aa4f55c2e7a20efc22f1a8c52ee80 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 17 Nov 2015 03:31:32 +0100 Subject: move strerror*.c to new dir: strerror/ MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/string/strerror/strerror_r_xsi.c | 56 ++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 src/string/strerror/strerror_r_xsi.c (limited to 'src/string/strerror/strerror_r_xsi.c') diff --git a/src/string/strerror/strerror_r_xsi.c b/src/string/strerror/strerror_r_xsi.c new file mode 100644 index 0000000..70c3bc8 --- /dev/null +++ b/src/string/strerror/strerror_r_xsi.c @@ -0,0 +1,56 @@ +/** + * 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 +#include + + + +/** + * Reenterant variant of `strerror`. + * + * This is an XSI-compliant extension. However the name + * is not part of the XSI specification, `strerror_r` + * should be used. It is defined to this function if + * `(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE`. + * However it is not defined if _SLIBC_SOURCE is defined. + * + * @param errnum The error code. + * @param buf Buffer where the description shall be stored. + * @param buflen The allocation size of `buf`. + * @return Zero on success, value for `errno` on error + * + * @throws ERANGE `buf` was too small to store the description. + */ +int __xsi_strerror_r(int errnum, char* buf, size_t buflen) +{ + char* description = strerror(errnum); + size_t length = strlen(description); + + if (buflen == 0) + return ERANGE; + + if (buflen <= length) + { + memcpy(buf, description, buflen - 1); + buf[buflen - 1] = 0; + return ERANGE; + } + + return memcpy(buf, description, length + 1), 0; +} + -- cgit v1.2.3-70-g09d2