// strstr.c查找完全匹配的子字符串 #include<stdio.h> #include<string.h> char *my_strstr(const char *s1,const char *s2) { const char *p=s1; const int len=strlen(s2); for(;(p=strchr(p,*s2))!=0;p++) { if(strncmp(p,s2,len)==0) return(char *)p; } return (0); } char *my_strstr1(const char *s1, const char *s2) { int n; if (*s2) { while (*s1) { for (n=0; *(s1 + n) == *(s2 + n); n++) { if (!*(s2 + n + 1)) return (char *)s1; } s1++; } return NULL; } else return (char *)s1; } char *my_strstr2( const char *s1, const char *s2 ) { int len2; if ( !(len2 = strlen(s2)) )//此种情况下s2不能指向空,否则strlen无法测出长度,这条语句错误 return (char *)s1; for ( ; *s1; ++s1 ) { if ( *s1 == *s2 && strncmp( s1, s2, len2 )==0 ) return (char *)s1; } return NULL; } int main() { char *s="Golden Global View"; char *l="lob"; char *p; //p=strstr(s,l); //p=my_strstr(s,l); p=my_strstr(s,l); if(p) printf("s=%s,p=%s\n",s,p); else printf("Not Found!\n"); { char * rmlst = "ppp3.3/222.222.222.222"; char * cp1=NULL,* ipintf=NULL,*pubAddr=NULL; cp1 = strstr(rmlst, "/"); if ( cp1 == NULL ) return; /* *cp1 = ‘\0‘; strncpy(ipintf, rmlst, cp1-rmlst); strcpy(pubAddr, cp1+1); */ printf("~~~~~~~~~~~,rmlst=%s,ipintf=%s,pubAddr=%s,cp1+1=%s\n\n\n\n", rmlst,ipintf,pubAddr,cp1+1); } getchar(); return 0; }
时间: 2024-10-27 00:09:24