Re: [Dev-C++] Allocation problem

[Per W. <pw...@ia...>]

When you allocate buffers for strings, you must allocate room for
strlen(str)+1
characters, or the termination character '\0' will not fit.

/Per W

On Fri, 19 Sep 2003, Matthews wrote:

> I'm working on a program to generate makefiles for me, and I currently have
> it set up to read different sections of a file to generate the options.
> One section is %input, which has a list of filenames to include, eg.
>
> prj.txt
>
> %input
> main.c
> vid.c
> gui.c
>
> I read these into a struct organized like so:
>
> struct prj_info
> {
>   ...
>   char **input;
>   ...
> }
>
> And I allocate space based on how many files there are (an array of
> strings, basically)
>
> My problem is that I get errors when running the following C code:
>
> if(!strncmp("%include",t,strlen(t)-1))
> {
>   count = 0;
>   skip_line(buf);
>   getword(buf,t);
>   longest_length = strlen(t);
>   info.input = (char *)malloc((sizeof(char)*longest_len)*1);
>   if(!info.input)
>   {
>     printf("OH NOS\n");
>     return 0;
>   }
>   //CRASH HERE
>   strcpy(info.input[count],t);
>   while(*buf!='%')
>   {
>     while(*buf=='#'||isspace(*buf)) skip_line(buf);
>     getword(buf,t);
>     if(strlen(t)>longest_length) longest_length = strlen(t);
>     count++;
>     realloc(info.input,(sizeof(char)*longest_length)*count);
>     if(!info.input)
>     {
> 	printf("ERR0RZ\n");
> 	return 0;
>     }
>     strcpy(info.input[count],t);
>     skip_line(buf);
>   }
> }
>
> Buf is the dumped contents of a file (like prj.txt), getword() places a
> word from buf into t and skip_line() skips to the next line in buf.
>
> The code compiles fine, but crashes at the first strcpy().  Any help would
> be appreciated.
>
>
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