strstr.c

来自「mips架构的bootloader,99左右的版本 但源代码现在没人更新了」· C语言 代码 · 共 32 行

/*************************************************************
 * File: lib/strstr.c
 * Purpose: Part of C runtime library
 * Author: Phil Bunce ([e-mail])
 * Revision History:
 *	970304	Start of revision history
 */

#include "string.h"

/** char *strstr(p,q) returns a ptr to q in p, else 0 if not found */
char *strstr(p,q)
char *p,*q;
{
char *s,*t;

if (!p || !q) return(0);

if (! *q) return(p);
for (;*p;p++) {
	if (*p == *q) {
		t = p; s = q;
		for (;*t;s++,t++) {
			if (*t != *s) break;
			}
		if (! *s) return(p);
		}
	}
return(0);
}