在C中为字符串数组分配空间

Question

I need help malloc space for a string array and then returning this value as a pointer.

How do I go about doing this? My code is:

char * strArray[*arrLen] = malloc(srcStrLen - numOfDelimsInStr + (numOfDelimsInStr + 1));

I populate string array with memcpy and manual '\\0' adds. Then I return the value via:

return (char **) strArray;

The error and warning I get upon compile are:

answer03.c:48:3: error: variable-sized object may not be initialized
   char * strArray[*arrLen] = malloc(srcStrLen - numOfDelimsInStr + (numOfDelimsInStr + 1));
   ^
answer03.c:68:3: warning: function returns address of local variable [-Wreturn-local-addr]
   return (char **) strArray;
   ^
make: *** [all] Error 1

Answer 1

First, allocate memory for strArray .

Assuming, arrLen is an integral variable, not a pointer,

char** strArray = malloc(arrLen*sizeof(*strArray));
if ( strArray == NULL )
{
   // Deal with error condition
}

Then, allocate memory for each element of the array.

for ( i = 0; i < arrLen; ++i )
{
   strArray[i] = malloc(srcStrLen - numOfDelimsInStr + (numOfDelimsInStr + 1));
   if ( strArray[i] == NULL )
   {
      // Deal with error condition
   }
}

Then, return the array.

return strArray;