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Diffstat (limited to 'REORG.TODO/string/_strerror.c')
-rw-r--r-- | REORG.TODO/string/_strerror.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/REORG.TODO/string/_strerror.c b/REORG.TODO/string/_strerror.c new file mode 100644 index 0000000000..4d3a52d906 --- /dev/null +++ b/REORG.TODO/string/_strerror.c @@ -0,0 +1,74 @@ +/* Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <libintl.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/param.h> +#include <_itoa.h> + +/* It is critical here that we always use the `dcgettext' function for + the message translation. Since <libintl.h> only defines the macro + `dgettext' to use `dcgettext' for optimizing programs this is not + always guaranteed. */ +#ifndef dgettext +# include <locale.h> /* We need LC_MESSAGES. */ +# define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES) +#endif + +/* Return a string describing the errno code in ERRNUM. */ +char * +__strerror_r (int errnum, char *buf, size_t buflen) +{ + if (__builtin_expect (errnum < 0 || errnum >= _sys_nerr_internal + || _sys_errlist_internal[errnum] == NULL, 0)) + { + /* Buffer we use to print the number in. For a maximum size for + `int' of 8 bytes we never need more than 20 digits. */ + char numbuf[21]; + const char *unk = _("Unknown error "); + size_t unklen = strlen (unk); + char *p, *q; + bool negative = errnum < 0; + + numbuf[20] = '\0'; + p = _itoa_word (abs (errnum), &numbuf[20], 10, 0); + + /* Now construct the result while taking care for the destination + buffer size. */ + q = __mempcpy (buf, unk, MIN (unklen, buflen)); + if (negative && unklen < buflen) + { + *q++ = '-'; + ++unklen; + } + if (unklen < buflen) + memcpy (q, p, MIN ((size_t) (&numbuf[21] - p), buflen - unklen)); + + /* Terminate the string in any case. */ + if (buflen > 0) + buf[buflen - 1] = '\0'; + + return buf; + } + + return (char *) _(_sys_errlist_internal[errnum]); +} +weak_alias (__strerror_r, strerror_r) +libc_hidden_def (__strerror_r) |