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Add strxfrm (#160)

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Gautham 2021-05-01 17:23:23 +05:30 • committed by GitHub
parent c029e83dd8
commit 3aa8983ec1
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2 changed files with 49 additions and 0 deletions
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1
libc/str/str.h
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@ -156,6 +156,7 @@ char16_t *strcat16(char16_t *, const char16_t *) memcpyesque;
wchar_t *wcscat(wchar_t *, const wchar_t *) memcpyesque;
size_t strlcpy(char *, const char *, size_t);
size_t strlcat(char *, const char *, size_t);
size_t strxfrm(char *, const char *, size_t);
char *strcpy(char *, const char *) memcpyesque;
char16_t *strcpy16(char16_t *, const char16_t *) memcpyesque;
wchar_t *wcscpy(wchar_t *, const wchar_t *) memcpyesque;

48
libc/str/strxfrm.c Normal file
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@ -0,0 +1,48 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ This is free and unencumbered software released into the public domain. │
│ │
│ Anyone is free to copy, modify, publish, use, compile, sell, or │
│ distribute this software, either in source code form or as a compiled │
│ binary, for any purpose, commercial or non-commercial, and by any │
│ means. │
│ │
│ In jurisdictions that recognize copyright laws, the author or authors │
│ of this software dedicate any and all copyright interest in the │
│ software to the public domain. We make this dedication for the benefit │
│ of the public at large and to the detriment of our heirs and │
│ successors. We intend this dedication to be an overt act of │
│ relinquishment in perpetuity of all present and future rights to this │
│ software under copyright law. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
│ OTHER DEALINGS IN THE SOFTWARE. │
│ │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/str/str.h"
/**
* transforms strings into the current C locale.
* calling strcmp() on two strxfrm()-ed strings
* is same as calling strcoll() on the originals.
*
* @param dest is buffer which needn't be initialized
* @param src is a NUL-terminated string
* @param count is number of bytes to write to destination
* @return length of transformed string
* @note dest and src can't overlap
* @note dest array size should be greater than count
* @note if dest is NULL, count has to be zero
*/
size_t strxfrm(char *dest, const char *src, size_t count) {
assert(dest == NULL ? count == 0 : 1);
return strlcpy(dest, src, count);
}