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Find the first occurrence of a character in a buffer
#include <string.h>
void* memchr(void* buf,
int ch,
size_t length );
- buf
- The buffer that you want to search.
- ch
- The character that you're looking for.
- length
- The number of bytes to search in the buffer.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The memchr() function locates the first occurrence of
ch (converted to an unsigned char) in the
first length bytes of the buffer pointed to by buf.
A pointer to the located character, or NULL if ch
couldn't be found.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main( void )
{
char buffer[80];
char* where;
strcpy( buffer, "video x-rays" );
where = (char *) memchr( buffer, 'x', 6 );
if( where == NULL ) {
printf( "'x' not found\n" );
} else {
printf( "%s\n", where );
}
where = (char *) memchr( buffer, 'r', 9 );
if( where == NULL ) {
printf( "'r' not found\n" );
} else {
printf( "%s\n", where );
}
return EXIT_SUCCESS;
}
produces the output:
'x' not found
rays
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
memccpy(),
memcmp(),
memcpy(),
memicmp(),
memmove(),
memset()
strchr(),
strrchr(),
wmemchr(),
wmemcmp(),
wmemcpy(),
wmemmove(),
wmemset()
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