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/**
* 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 <string.h>
#include <stddef.h>
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte is encountered.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @return `whither` is returned.
*/
char* strcpy(char* restrict whither, const char* restrict whence)
{
return memcpy(whither, whence, strlen(whence) + 1);
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte is encountered.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @return `whither + strlen(whence)` is returned.
*/
char* stpcpy(char* restrict whither, const char* restrict whence)
{
return mempcpy(whither, whence, strlen(whence) + 1) - 1;
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte or a specified byte is encountered.
*
* This is a slibc extension added for completeness.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param c The stop byte.
* @return `NULL` if `c` was not encountered, otherwise
* the position of `c` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written non-NUL
* character.
*/
char* strccpy(char* restrict whither, const char* restrict whence, int c)
{
char* r = memccpy(whither, whence, c, strlen(whence) + 1);
if (r)
*r = 0;
return r;
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte or a specified substring is encountered.
*
* This is a slibc extension added for completeness.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param str The substring, ignored if `NULL`.
* @return `NULL` if `str` was not encountered, otherwise
* the position of `str` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written non-NUL
* character.
*/
char* strstrcpy(char* restrict whither, const char* restrict whence, const char* restrict str)
{
const char* stop = str == NULL ? NULL : strstr(whence, str);
size_t n = stop == NULL ? strlen(whence) : (size_t)(stop - whence);
char* r = stop == NULL ? NULL ? whither + n;
memcpy(whither, whence, n);
whither[n] = 0;
return r;
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte is encountered.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param maxlen The maximum number of bytes to copy.
* NOTE that if the resulting string at least this
* long, no NUL byte will be written to `whither'.
* On the otherhand, if the resultnig string is
* shorter, `whither` will be filled with NUL bytes
* until this amount of bytes have been written.
* @return `whither` is returned.
*/
char* strncpy(char* restrict whither, const char* restrict whence, size_t maxlen)
{
size_t n = strnlen(whence, maxlen);
memcpy(whither, whence, n);
memset(whither, 0, maxlen - n);
return whither;
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte is encountered.
*
* This is a GNU extension.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param maxlen The maximum number of bytes to copy.
* NOTE that if the resulting string at least this
* long, no NUL byte will be written to `whither'.
* On the otherhand, if the resultnig string is
* shorter, `whither` will be filled with NUL bytes
* until this amount of bytes have been written.
* @return `whither` plus the number of written bytes,
* excluding NUL bytes, is returned.
*/
char* stpncpy(char* restrict whither, const char* restrict whence, size_t maxlen)
{
size_t n = strnlen(whence, maxlen);
memcpy(whither, whence, n);
memset(whither, 0, maxlen - n);
return whither + n;
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte or a specified byte is encountered.
*
* This is a slibc extension added for completeness.
* It is only available if GNU extensions are available.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param c The stop byte.
* @param maxlen The maximum number of bytes to copy.
* NOTE that if the resulting string at least this
* long, no NUL byte will be written to `whither'.
* On the otherhand, if the resultnig string is
* shorter, `whither` will be filled with NUL bytes
* until this amount of bytes have been written.
* @return `NULL` if `c` was not encountered, otherwise
* the position of `c` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written non-NUL
* character.
*/
char* strcncpy(char* restrict whither, const char* restrict whence, int c, size_t maxlen)
{
const char* stop = memchr(whence, c, maxlen);
size_t n = stop == NULL ? strnlen(whence, maxlen) : (size_t)(stop - whence);
char* r = stop == NULL ? NULL : (whither + n);
memcpy(whither, whence, n);
memset(whither, 0, maxlen - n);
return r;
}
/**
* Copy a memory segment to another, non-overlapping, segment,
* stop when a NUL byte or a specified substring is encountered.
*
* This is a slibc extension added for completeness.
* It is only available if GNU extensions are available.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param str The substring, ignored if `NULL`.
* NOTE that if the resulting string at least this
* long, no NUL byte will be written to `whither'.
* On the otherhand, if the resultnig string is
* shorter, `whither` will be filled with NUL bytes
* until this amount of bytes have been written.
* @param maxlen The maximum number of bytes to copy.
* @return `NULL` if `str` was not encountered, otherwise
* the position of `str` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written non-NUL
* character.
*/
char* strstrncpy(char* restrict whither, const char* restrict whence,
const char* restrict str, size_t maxlen)
{
const char* stop = strnstr(whence, str, maxlen);
size_t n = stop == NULL ? strnlen(whence, maxlen) : (size_t)(stop - whence);
char* r = stop == NULL ? NULL : (whither + n);
memcpy(whither, whence, n);
memset(whither, 0, maxlen - n);
return r;
}
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