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107b8a922a
2006-08-14 Ulrich Drepper <drepper@redhat.com> [BZ #1996] * libio/memstream.c (open_memstream): Allocate initial buffer with calloc. * libio/wmemstream.c (open_wmemstream): Likewise. * libio/strops.c: Pretty printing. (_IO_str_overflow): Clear uninitialized part of the new buffer. (enlarge_userbuf): New function. (_IO_str_seekoff): Call it if seek position is larger than current buffer. * libio/wstrops.c: Likewise. * libio/vasprintf.c: Add comment as to why we do not have to use calloc instead of malloc to allocate initial buffer. * libio/Makefile (tests): Add bug-memstream1 and bug-wmemstream1. * libio/bug-memstream1.c: New file. * libio/bug-wmemstream1.c: New file.
134 lines
2.3 KiB
C
134 lines
2.3 KiB
C
#include <stdio.h>
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#include <string.h>
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static int
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do_test (void)
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{
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size_t size;
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char *buf;
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FILE *fp = open_memstream (&buf, &size);
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if (fp == NULL)
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{
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puts ("open_memstream failed");
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return 1;
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}
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off64_t off = ftello64 (fp);
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if (off != 0)
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{
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puts ("initial position wrong");
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return 1;
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}
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if (fseek (fp, 32768, SEEK_SET) != 0)
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{
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puts ("fseek failed");
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return 1;
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}
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if (fputs ("foo", fp) == EOF)
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{
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puts ("fputs failed");
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return 1;
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}
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if (fclose (fp) == EOF)
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{
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puts ("fclose failed");
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return 1;
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}
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if (size != 32768 + 3)
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{
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printf ("expected size %d, got %zu\n", 32768 + 3, size);
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return 1;
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}
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for (int i = 0; i < 32768; ++i)
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if (buf[i] != '\0')
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{
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printf ("byte at offset %d is %#hhx\n", i, buf[i]);
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return 1;
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}
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if (memcmp (buf + 32768, "foo", 3) != 0)
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{
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puts ("written string incorrect");
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return 1;
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}
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/* Mark the buffer. */
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memset (buf, 'A', size);
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free (buf);
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/* Try again, this time with write mode enabled before the seek. */
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fp = open_memstream (&buf, &size);
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if (fp == NULL)
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{
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puts ("2nd open_memstream failed");
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return 1;
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}
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off = ftello64 (fp);
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if (off != 0)
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{
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puts ("2nd initial position wrong");
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return 1;
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}
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if (fputs ("bar", fp) == EOF)
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{
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puts ("2nd fputs failed");
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return 1;
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}
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if (fseek (fp, 32768, SEEK_SET) != 0)
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{
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puts ("2nd fseek failed");
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return 1;
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}
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if (fputs ("foo", fp) == EOF)
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{
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puts ("3rd fputs failed");
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return 1;
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}
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if (fclose (fp) == EOF)
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{
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puts ("2nd fclose failed");
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return 1;
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}
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if (size != 32768 + 3)
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{
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printf ("2nd expected size %d, got %zu\n", 32768 + 3, size);
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return 1;
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}
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if (memcmp (buf, "bar", 3) != 0)
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{
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puts ("initial string incorrect in 2nd try");
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return 1;
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}
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for (int i = 3; i < 32768; ++i)
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if (buf[i] != '\0')
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{
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printf ("byte at offset %d is %#hhx in 2nd try\n", i, buf[i]);
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return 1;
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}
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if (memcmp (buf + 32768, "foo", 3) != 0)
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{
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puts ("written string incorrect in 2nd try");
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return 1;
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}
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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