#include <errno.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> static char fname[] = "/tmp/rndseek.XXXXXX"; static char tempdata[65 * 1024]; static int do_test (void); #define TEST_FUNCTION do_test () #define TIMEOUT 10 #include "../test-skeleton.c" static int fp_test (const char *name, FILE *fp) { int result = 0; int rounds = 10000; do { int idx = random () % (sizeof (tempdata) - 2); char ch1; char ch2; if (fseek (fp, idx, SEEK_SET) != 0) { printf ("%s: %d: fseek failed: %m\n", name, rounds); result = 1; break; } ch1 = fgetc_unlocked (fp); ch2 = tempdata[idx]; if (ch1 != ch2) { printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n", name, rounds, idx, ch1, ch2); result = 1; break; } ch1 = fgetc (fp); ch2 = tempdata[idx + 1]; if (ch1 != ch2) { printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n", name, rounds, idx + 1, ch1, ch2); result = 1; break; } } while (--rounds > 0); fclose (fp); return result; } static int do_test (void) { int fd; FILE *fp; size_t i; int result; fd = mkstemp (fname); if (fd == -1) { printf ("cannot open temporary file: %m\n"); return 1; } /* Make sure the file gets removed. */ add_temp_file (fname); /* Repeatability demands this. */ srandom (42); /* First create some temporary data. */ for (i = 0; i < sizeof (tempdata); ++i) tempdata[i] = 'a' + random () % 26; /* Write this data to a file. */ if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata))) != sizeof (tempdata)) { printf ("cannot wrote data to temporary file: %m\n"); return 1; } /* Now try reading the data. */ fp = fdopen (dup (fd), "r"); if (fp == NULL) { printf ("cannot duplicate temporary file descriptor: %m\n"); return 1; } rewind (fp); for (i = 0; i < sizeof (tempdata); ++i) { int ch0 = fgetc (fp); char ch1 = ch0; char ch2 = tempdata[i]; if (ch0 == EOF) { puts ("premature end of file while reading data"); return 1; } if (ch1 != ch2) { printf ("%zd: '%c' vs '%c'\n", i, ch1, ch2); return 1; } } result = fp_test ("fdopen(\"r\")", fp); fp = fopen (fname, "r"); result |= fp_test ("fopen(\"r\")", fp); fp = fopen64 (fname, "r"); result |= fp_test ("fopen64(\"r\")", fp); /* The "rw" mode will prevent the mmap-using code from being used. */ fp = fdopen (fd, "rw"); result = fp_test ("fdopen(\"rw\")", fp); fp = fopen (fname, "rw"); result |= fp_test ("fopen(\"rw\")", fp); fp = fopen64 (fname, "rw"); result |= fp_test ("fopen64(\"rw\")", fp); return result; }