将文件名连接到目录名

Question

我想在 c 中将目录添加到文件名，但出现如下错误:

Segmentation fault (core dumped)

这是我的代码:

char fname[255];
char directoryTmp[262];

/*Working Code for entering the filename fname with fgets() */
...

/* specify the directory */ 
directoryTmp[0] = "/";
directoryTmp[1] = "f";
directoryTmp[2] = "i";
directoryTmp[3] = "l";
directoryTmp[4] = "e";
directoryTmp[5] = "s";
directoryTmp[6] = "/";

/* Copy fname at the end of directoryTmp */
strcat(directoryTmp,fname);

/* new fname with the directory, should look like: "/files/afilename */
for(i=0;i<strlen(directoryTmp);i++){
    fname[i] = directoryTmp[i];
}

//编辑

好的，这是我的新代码，但我仍然得到相同的错误代码:

char fname[255];
char directory[262];

directory[sizeof(directory) - 1] = '\0';
strncpy(directory,sizeof(directory) - 1, "/files/");


for(i=0;i<strlen(directory);i++){
    fname[i] = directory[i];
}
puts(fname);

fname[sizeof(fname) - 1] = '\0';

Answer 1

char 放在单引号 ('') 中，而不是双引号 ("")。您正在为每个数组索引分配字符串文字。