Messages in this thread | | | Date | Thu, 19 Aug 2004 09:42:41 -0400 | From | Lei Yang <> | Subject | problem with fwrite |
| |
Hi all,
This is not really a kernel issue, apologize if anyone thinks that this is not the right place to post it. But I am writing a kernel module and got stuck on fwrite, really hope someone could point out what stupid mistake I've made. I wrote a very simple code to test the idea, what I really want to do in fred() is to read from 'dest' and write to 'src'. It seems that upon running , fgetc doesn't get anything from in_stream, so the first char it gets is an EOF and it breaks. Just why fwrite didn't write anything to in_stream?
If this is not the right way to do it, what is ?
Appreciate any comments, even harsh ones.
TIA Lei
// in test.c
#include <stdio.h>
fred(char *dest, size_t *destlen, char *src, size_t size) { FILE *in_stream = tmpfile(); FILE *out_stream = tmpfile(); fwrite(src, 1, size, in_stream);
int c, i; for(i = 0;;i++) { c = fgetc(in_stream); fprintf(stderr, "get char %c\n", c); if ( c == EOF) break; fputc(c, out_stream); }
*destlen = i; fseek(out_stream, 0, SEEK_SET); //rewind fread(dest, 1, *destlen, out_stream); fclose(in_stream); fclose(out_stream); fprintf(stderr, "buf = `%s', size = %d\n", dest, *destlen); }
int main(void) { static char source[] = "really hope this works ";
char *bp = malloc (2048); size_t destlen;
fred(bp, &destlen, source, strlen(source));
fprintf(stderr, "buf = `%s', size = %d\n", bp, destlen); return 0; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |