Editing memchr - FilterMeisterWiki

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= memchr =

== Syntax ==
{{void *memchr(const void *membuffer, int val, int size)}}

== Arguments ==
:'''membuffer'''
::The string / memory buffer to search
:'''val'''
::The byte value to search for
:'''size'''
::The size (in bytes) of the memory block to search. Must be equal to or less than the buffer size, or buffer overrun errors can occur.

== Return ==
Returns a memory location pointer to the first occurrence of the given value in the memory block, or NULL if the value is not found.

== Description ==
memchr searches a block of memory for the first occurrence of a given value.  It can be used to find the first appearance of a letter in a string.  For PHP programmers, memchr is similar to strpos.

== Example ==
<code>
// Allocate memory for a string
char *stringbuffer;
stringbuffer = malloc(1000);
sprintf(stringbuffer, "whatever");

// Search for first letter e
char* stringpointer;
stringpointer = memchr(stringbuffer, 'e', strlen(stringbuffer));

// Print everything after first
// letter e if found, or show
// a message if not
if (stringpointer != NULL) {
  // This should print "ever"
  printf("%s", stringpointer);
}
else {
  printf("Character not found.");
}

// Release the memory again
free(stringbuffer);
</code>

== See Also ==
((sprintf)), ((strncmp)), ((strcmp))

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