#include <fcntl.h> #include <stdio.h> #include <string.h> #include <unistd.h> static int fd; static char *fname; static void prepare (void); #define PREPARE(argc, argv) prepare () #define TEST_FUNCTION do_test () static int do_test (void); #include "../test-skeleton.c" static void prepare (void) { fd = create_temp_file ("wrewind.", &fname); if (fd == -1) exit (3); } static int do_test (void) { char buf[100]; FILE *fp; int result = 0; fp = fdopen (fd, "w"); if (fp == NULL) { puts ("cannot create file"); exit (1); } if (fputs ("one\n", fp) == EOF || fputs ("two\n", fp) == EOF) { puts ("cannot create filec content"); exit (1); } fclose (fp); fp = fopen (fname, "a+"); if (fp == NULL) { puts ("cannot fopen a+"); exit (1); } if (fgets (buf, sizeof (buf), fp) == NULL) { puts ("cannot read after fopen a+"); exit (1); } if (strcmp (buf, "one\n") != 0) { puts ("read after fopen a+ produced wrong result"); result = 1; } fclose (fp); fd = open (fname, O_RDWR); if (fd == -1) { puts ("open failed"); exit (1); } fp = fdopen (fd, "a+"); if (fp == NULL) { puts ("fopen after open failed"); exit (1); } if (fgets (buf, sizeof (buf), fp) == NULL) { puts ("cannot read after fdopen a+"); exit (1); } if (strcmp (buf, "one\n") != 0) { puts ("read after fdopen a+ produced wrong result"); result = 1; } fclose (fp); return result; }