我有三个文件：
某事.h
typedef struct {
int size_t;
char *c;
} p;
p ** createMatrix(int r, int c);
void printMatrix(p **matrix, const int r, const int c);
某事.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "something.h"
p **
createMatrix(int r, int c)
{
int rowsize=r*2+1;
int colsize=c*2+1;
/* memory alloc of rows */
p **matrix=malloc(rowsize*sizeof(p *));
int k;
for(k=0; k<rowsize; k++)
{
/* memory alloc of columns */
matrix[k]=malloc(colsize*sizeof(p));
}
int i, j;
for(i=0; i<rowsize; i++)
{
for(j=0; j<colsize; j++)
{
/* columns is between letters */
if(j%2!=0)
{
matrix[i][j].size_t=7;
matrix[i][j].c=malloc(8*sizeof(char));
strcpy(matrix[i][j].c," ");
}
else if(i%2==0 && j%2==0)
{
matrix[i][j].size_t=1;
matrix[i][j].c=malloc(sizeof(char));
*(matrix[i][j].c)='a';
}
else
{
matrix[i][j].size_t=1;
matrix[i][j].c=malloc(sizeof(char));
*(matrix[i][j].c)=' ';
}
}
}
return matrix;
}
void
printMatrix(p **matrix, const int r, const int c)
{
int rowsize=r*2+1;
int colsize=c*2+1;
printf("\n");
int i, j;
for(i=0; i<rowsize; i++)
{
printf("\t");
for(j=0; j<colsize; j++)
{
if(matrix[i][j].size_t==1)
printf("%c", *matrix[i][j].c);
else
printf("%s", matrix[i][j].c);
}
printf("\n");
}
printf("\n");
}
主程序
#include <stdlib.h>
#include <stdio.h>
#include "something.h"
void
printMenufunction(p **matrix, int rows, int cols)
{
int rowsize=rows*2+1;
int colsize=cols*2+1;
/* memory alloc of rows */
matrix=malloc(rowsize*sizeof(p *));
int i;
for(i=0; i<rowsize; i++)
/* memory alloc of columns */
matrix[i]=malloc(colsize*sizeof(p));
matrix=createMatrix(rows, cols);
}
int
main(void)
{
int rows, cols;
p **matrix;
char *stringtemp;
printf("ask for row and col in form (5x5):\n");
scanf("%s", stringtemp);
sscanf(stringtemp, "%dx%d", &rows, &cols);
printMenufunction(matrix, rows, cols);
printMatrix(matrix, rows, cols);
return 0;
}
这个简化的版本给我带来了分段错误。我不明白我要在哪里访问未分配的内存？有人可以解释一下吗？(SSCCE)