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1、常见C字符串处理函数的源代码以下是一些常见C字符串处理函数的源代码，学习它一个好处是加深理解C语言的理解，另一个好外是应聘面试中的笔试常常会用到它们，当然，还有一些没有列出来，或者有更好的实现方法，希望大家一起分享一下share your code! :)/stirng.c=char *strcat(char *strDes, const char *strSrc)免费论文 assert(strDes != NULL) & (strSrc != NULL); char *address = strDes; while (*strDes != 0) + strDes; while (*strDe
2、s + = *strSrc +) != 0) NULL; return address;int strlen(const char *str) assert(str != NULL); int len = 0; while (*str + != 0) + len; return len;char *strdup(const char *strSrc) assert(strSrc != NULL); int len = 0; while (*strSrc + != 0) + len; char *strDes = (char *) malloc (len + 1); while (*strDes
3、 + = *strSrc +) != 0) NULL; return strDes;char *strcpy(char *strDes, const char *strSrc) assert(strDes != NULL) & (strSrc != NULL); char *address = strDes; while (*strDes + = *strSrc +) != 0) NULL; return address;char *strchr_(char *str, int c) assert(str != NULL); while (*str != (char) c) & (*str !
4、= 0) str +; if (*str != 0) return str; return NULL;char *strchr(const char *str, int c) assert(str != NULL); for (; *str != (char) c; + str) if (*str = 0) return NULL; return (char *) str;int strcmp(const char *s, const char *t) assert(s != NULL & t != NULL); while (*s & *t & *s = *t) + s; + t; retu
5、rn (*s - *t);char *strstr(const char *strSrc, const char *str) assert(strSrc != NULL & str != NULL); const char *s = strSrc; const char *t = str; for (; *t != 0; + strSrc) for (s = strSrc, t = str; *t != 0 & *s = *t; +s, +t) NULL; if (*t = 0) return (char *) strSrc; return NULL;char *strncpy(char *s
6、trDes, const char *strSrc, int count) assert(strDes != NULL & strSrc != NULL); char *address = strDes; while (count - & *strSrc != 0) *strDes + = *strSrc +; return address;char *strncat(char *strDes, const char *strSrc, int count) assert(strDes != NULL) & (strSrc != NULL); char *address = strDes; wh
7、ile (*strDes != 0) + strDes; while (count - & *strSrc != 0 ) *strDes + = *strSrc +; *strDes = 0; return address;int strncmp(const char *s, const char *t, int count) assert(s != NULL) & (t != NULL); while (*s & *t & *s = *t & count -) + s; + t; return (*s - *t);char *strpbrk(const char *strSrc, const
8、 char *str) assert(strSrc != NULL) & (str != NULL); const char *s; while (*strSrc != 0) s = str; while (*s != 0) if (*strSrc = *s) return (char *) strSrc; + s; + strSrc; return NULL;int strcspn(const char *strSrc, const char *str) assert(strSrc != NULL) & (str != NULL); const char *s; const char *t
9、= strSrc; while (*t != 0) s = str; while (*s != 0) if (*t = *s) return t - strSrc; + s; + t; return 0;char *strcat(char *strDes, const char *strSrc) assert(strDes != NULL) & (strSrc != NULL); char *address = strDes; while (*strDes != 0) + strDes; while (*strDes + = *strSrc +) != 0) NULL; return addr
10、ess;int strlen(const char *str) assert(str != NULL); int len = 0; while (*str + != 0) + len; return len;char *strdup(const char *strSrc) assert(strSrc != NULL); int len = 0; while (*strSrc + != 0) + len; char *strDes = (char *) malloc (len + 1); while (*strDes + = *strSrc +) != 0) NULL; return strDe
11、s;int strspn(const char *strSrc, const char *str) assert(strSrc != NULL) & (str != NULL); const char *s; const char *t = strSrc; while (*t != 0) s = str; while (*s != 0) if (*t = *s) break; + s; if (*s = 0) return t - strSrc; + t; return 0;char *strrchr(const char *str, int c)我要论文网 assert(str != NULL); const char *s = str; while (*s != 0) + s; for (- s; *s != (char) c; - s) if (s = str) return NULL; return (char *) s;char* strrev(char *str) assert(str != NULL); char *s = str
