diff options
Diffstat (limited to 'stdio-common/test_rdwr.c')
| -rw-r--r-- | stdio-common/test_rdwr.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/stdio-common/test_rdwr.c b/stdio-common/test_rdwr.c new file mode 100644 index 0000000000..f987f16cd4 --- /dev/null +++ b/stdio-common/test_rdwr.c @@ -0,0 +1,130 @@ +/* Copyright (C) 1991, 1992 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + + +int +DEFUN(main, (argc, argv), int argc AND char **argv) +{ + static CONST char hello[] = "Hello, world.\n"; + static CONST char replace[] = "Hewwo, world.\n"; + static CONST size_t replace_from = 2, replace_to = 4; + char filename[FILENAME_MAX]; + char *name = strrchr(*argv, '/'); + char buf[BUFSIZ]; + FILE *f; + int lose = 0; + + if (name != NULL) + ++name; + else + name = *argv; + + (void) sprintf(filename, "/tmp/%s.test", name); + + f = fopen(filename, "w+"); + if (f == NULL) + { + perror(filename); + exit(1); + } + + (void) fputs(hello, f); + rewind(f); + (void) fgets(buf, sizeof(buf), f); + rewind(f); + (void) fputs(buf, f); + rewind(f); + { + register size_t i; + for (i = 0; i < replace_from; ++i) + { + int c = getc(f); + if (c == EOF) + { + printf("EOF at %u.\n", i); + lose = 1; + break; + } + else if (c != hello[i]) + { + printf("Got '%c' instead of '%c' at %u.\n", + (unsigned char) c, hello[i], i); + lose = 1; + break; + } + } + } + + { + long int where = ftell(f); + if (where == replace_from) + { + register size_t i; + for (i = replace_from; i < replace_to; ++i) + if (putc(replace[i], f) == EOF) + { + printf("putc('%c') got %s at %u.\n", + replace[i], strerror(errno), i); + lose = 1; + break; + } + } + else if (where == -1L) + { + printf("ftell got %s (should be at %u).\n", + strerror(errno), replace_from); + lose = 1; + } + else + { + printf("ftell returns %u; should be %u.\n", where, replace_from); + lose = 1; + } + } + + if (!lose) + { + rewind(f); + if (fgets(buf, sizeof(buf), f) == NULL) + { + printf("fgets got %s.\n", strerror(errno)); + lose = 1; + } + else if (strcmp(buf, replace)) + { + printf("Read \"%s\" instead of \"%s\".\n", buf, replace); + lose = 1; + } + } + + if (lose) + printf("Test FAILED! Losing file is \"%s\".\n", filename); + else + { + (void) remove(filename); + puts("Test succeeded."); + } + + exit(lose ? EXIT_FAILURE : EXIT_SUCCESS); +} |