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malloc in unix

Posted on 2003-11-11
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Last Modified: 2008-02-26
hi i wrote  a program in mandrake 9.1 version. ı had to use two dimensional array
char **inputdata;
int count;
inputdata = (char**)malloc(10*sizeof(char));
works correctly but after this ı wrote
for(count=0;count<9;++count)
inputdata[count] = (char*)malloc(5*sizeof(char));

first allocation step wroks correctly(for char**) but second doesnt.
there is no compile mistake.also this code works in mandrake 9.1 version but because of malloc problem it does not work my school's unix server. &#305; tried many ways.
if any one interests with whole code &#305; can send. pls mail at sinacetiner@yahoo.com for whole code
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Question by:sinacetiner
4 Comments
 
LVL 17

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rstaveley earned 50 total points
ID: 9722040
You need sizeof(char*) for the array of char*.

Like this:
--------8<--------
#include <stdio.h>

int main()
{
        char **inputdata;
        int count;
        inputdata = (char**)malloc(9*sizeof(char*));
        for(count=0;count<9;++count)
                inputdata[count] = (char*)malloc(5*sizeof(char));
        for(count=0;count<9;++count)
                sprintf(inputdata[count],"%04d",count);
        for(count=0;count<9;++count)
                printf("String %d is [%s] length %d\n",count+1,inputdata[count],strlen(inputdata[count]));
        for(count=0;count<9;++count)
                free(inputdata[count]);
        free(inputdata);
}
--------8<--------
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LVL 45

Expert Comment

by:sunnycoder
ID: 9722043
Hi sinacetiner,

> inputdata = (char**)malloc(10*sizeof(char));
inputdata = (char**)malloc(10*sizeof(char*));


Cheers!
Sunny:o)
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