C library functions - memchr ()

C standard library - <string.h>

description

C library functionsvoid * memchr (const void * str , int c, size_t n) nbytes before the argumentstrpoints to the string of search (an unsigned character) the position of the first occurrence of characterc.

statement

Here is () statement memchr function.

void *memchr(const void *str, int c, size_t n)

parameter

• str - points to the memory block to perform a search.
• c - int values passed, but the function of each byte search using the form unsigned char values.
• n - thenumber of bytes to be analyzed.

return value

This function returns a pointer to a pointer to the matching byte, if the character does not appear in a given area of ​​memory, it returns NULL.

Examples

The following example demonstrates memchr () function is used.

#include <stdio.h>
#include <string.h>

int main ()
{
   const char str[] = "http://www.w3cschool.cc";
   const char ch = '.';
   char *ret;

   ret = memchr(str, ch, strlen(str));

   printf("|%c| 之后的字符串是 - |%s|\n", ch, ret);

   return(0);
}

Let's compile and run the above program, which will result in the following:

|.| 之后的字符串是 - |.w3cschool.cc|

C standard library - <string.h>