strcat函数原型，strncat函数常见报错

/*原型：extern char *strncat(char *dest,char *src,int n);用法：#include 功能：把src所指字符串的前n个字符添加到dest结尾处（覆盖dest结尾处的\’\\0\’）并添加\’\\0\’。说明：src和dest所指内存区域不可以重叠且dest必须有足够的活动：慈云数据爆款香港服务器，CTG+CN2高速带宽、快速稳定、平均延迟10+ms 速度快，免备案，每月仅需19元！！ 点击查看空间来容纳src的字符串。返回指向dest的指针。*/#include #include char *strncat(char *dst, const char *src, size_t n){ if (n != 0) { //保存两个操作字符串的首地址 char *d = dst; const char *s = src; //将指向dst的指针d移到字符串末尾,指向\’\\0\’ while (*d != 0) d++; //复制过程 do { //如果到达了src字符串的末尾,则复制终止 if ((*d = *s++) == 0) break; //移向下一个元素 d++; } while (–n != 0); //复制后剩余要复制的元素个数 *d = 0; //复制完毕后,将最后一个元素置为\’\\0\’ } return dst; }int main() { char str[50] = \”Hello \”; char str2[50] = \”World!\”; strcat(str, str2); strncat(str, \” Goodbye World!\”, 3); puts(str);}

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//linux源码

#ifndef __HAVE_ARCH_STRNCAT /** * strncat – Append a length-limited, %NUL-terminated string to another * @dest: The string to be appended to * @src: The string to append to it * @count: The maximum numbers of bytes to copy * * Note that in contrast to strncpy(), strncat() ensures the result is * terminated. */ char *strncat(char *dest, const char *src, size_t count) { char *tmp = dest; if (count) { while (*dest) dest++; while ((*dest++ = *src++) != 0) { if (–count == 0) { *dest = \’\\0\’; break; } } } return tmp; } EXPORT_SYMBOL(strncat); #endif

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//标准C源码

/****strncat.c – append n chars of string to new string** Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.**Purpose:* defines strncat() – appends n characters of string onto* end of other string********************************************************************************/#include #include /****char *strncat(front, back, count) – append count chars of back onto front**Purpose:* Appends at most count characters of the string back onto the* end of front, and ALWAYS terminates with a null character.* If count is greater than the length of back, the length of back* is used instead. (Unlike strncpy, this routine does not pad out* to count characters).**Entry:* char *front – string to append onto* char *back – string to append* unsigned count – count of max characters to append**Exit:* returns a pointer to string appended onto (front).**Uses:**Exceptions:********************************************************************************/char * __cdecl strncat ( char * front, const char * back, size_t count ){ char *start = front; while (*front++) ; front–; while (count–) if (!(*front++ = *back++)) return(start); *front = \’\\0\’; return(start);}

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