> I checked again, up to the this problematic free(),
> functions return newly allocated strings properly:
>
> char *f( )
> {
> char *newstr = NULL;
> :
> newstr = (char *) malloc(p - sp + 1);
> if (newstr == NULL)
> return NULL;
> :
> return newstr;
> }
>
> Can a yet not executed wrong free() elsewhere cause a
> problem of this nature?
>
> Best regards
> Unga
>
i'm sorry i just dont really cant see a problem with free()
can you please explain it in a more simple way?
it really starts to exceed my screen height
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *a;
char *b;
char *c;
char *abd = "Hi, im a string
1\0";
char *bbd = "Hey, im a string 2\0";
char *f(char *d){
char *newstr = NULL; char *p, *sp;
sp = malloc(strlen (d)); memcpy(sp, d, strlen(d));
p = strchr(sp, 44);
newstr = (char *) malloc(p - sp + 1);
if (newstr == NULL){
newstr = malloc(1);
*newstr = '\0';
return newstr; /* you really dont want to return NULL to strlen() */
}
*p = '\0';
memcpy(newstr, sp, sizeof(char) * (p - sp));
return newstr;
}
char *f1(void){
char *ab;
ab = f(abd);
printf("f1(): %s\n", ab);
return ab;
}
char *f2(void){
char *bb;
bb = f(bbd);
printf("f2(): %s\n", bb);
return bb;
}
int
main(void)
{
while (1)
{
a = f1(); /* malloc and send a string */
b = f2(); /* malloc and send a string */
c =
(char *) malloc(strlen(a) + strlen(b) + 1);
c[0] = '\0';
strcat(c, a);
strcat(c, b);
printf("main(): %s\n", c);
free(a);
free(b);
free(c);
}
}
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