[英]C insert a string or(char*) in a dynamic 2D char array, Segmentation fault
So I need to program a 2-dimensional char
array that needs to get filled from some Child Processes. 因此,我需要编写一个需要从某些子进程中填充的二维char
数组。 I don't know how many lines will be returned at run-time. 我不知道在运行时将返回多少行。
I made a program that works well for the first three strings (or char*
) inserted, but after that I get segmentation fault errors. 我制作了一个程序,该程序对于插入的前三个字符串(或char*
)非常有效,但是之后出现了分段错误错误。 The array should keep the values/strings it has in it. 数组应保留其中的值/字符串。 Here's the code: 这是代码:
Global row count: 全局行数:
static int rows = 1;
Array initialisation: 数组初始化:
char **output = (char **)malloc(sizeof(char*) * 1);
output[0] = (char *)malloc(sizeof(char) * 1023);
output[0][0] = '#';
Adding: 新增:
char foo[1023];
insertArray(output, "bbb");
insertArray(output, foo);
insertArray(output, "bbb");
insertArray(output, "bbb");
It actually works fine the first 3 times 实际上前三遍效果很好
Function: 功能:
static void insertArray(char **c, char *itemToInsert) {
if (c[0][0] == '#') {
strncpy(c[0], itemToInsert, 1023);
}
else {
c = (char **)realloc(c, (rows + 1) * sizeof(char*));
for (int i = 0; i < rows+1; i++) {
c[i] = realloc(c[i],sizeof(char) * 1024);
}
strcpy(c[rows], itemToInsert);
rows++;
}
}
I just can't figure out whats wrong 我只是不知道怎么了
You lost result of your reallocation and next time you try to use old pointer to output
. 您丢失了重新分配的结果,并且下次尝试使用旧指针进行output
。
You can redesign like this: 您可以像这样重新设计:
output = insertArray(output, ...);
output = insertArray(output, ...);
output = insertArray(output, ...);
...
static char **insertArray(char **c, char const *itemToInsert)
{
...
return c;
}
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