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tst-fmemopen2.c
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/* fmemopen tests. Copyright (C) 2015-2016 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <assert.h> #include <stdio.h> #include <string.h> #include <sys/types.h> #include <errno.h> /* Check fmemopen with user provided buffer open for write. */ static int do_test_with_buffer (void) { int result = 0; char buf[100]; const size_t nbuf = sizeof (buf); FILE *fp = fmemopen (buf, nbuf, "w"); if (fp == NULL) { printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__); return 1; } /* Default write operation, check if file position is correct after it. */ static const char str[] = "hello world"; const size_t nstr = sizeof (str) - 1; fputs (str, fp); off_t o = ftello (fp); if (o != nstr) { printf ("FAIL: first ftello returned %jd, expected %zu\n", (intmax_t)o, nstr); result = 1; } /* Rewind stream and seek tests, the position size should be equal to buffer size provided in open function. */ rewind (fp); o = ftello (fp); if (o != 0) { printf ("FAIL: second ftello returned %jd, expected 0\n", (intmax_t)o); result = 1; } if (fseeko (fp, 0, SEEK_END) != 0) { printf ("FAIL: fseeko failed\n"); result = 1; } o = ftello (fp); if (o != nstr) { printf ("FAIL: third ftello returned %jd, expected %zu\n", (intmax_t)o, nstr); result = 1; } /* Rewind the stream and recheck by using a shorter string. */ rewind (fp); static const char str2[] = "just hello"; const size_t nstr2 = sizeof (str2) - 1; assert (nstr2 < nstr); fputs (str2, fp); o = ftello (fp); if (o != nstr2) { printf ("FAIL: fourth ftello returned %jd, expected %zu\n", (intmax_t)o, nstr2); result = 1; } fclose (fp); /* Again, but now with a larger string. */ static const char str3[] = "just hellod"; if (strcmp (buf, str3) != 0) { printf ("FAIL: final string is \"%s\", expected \"%s\"\n", buf, str3); result = 1; } return result; } /* Check fmemopen without user provided buffer open for write. */ static int do_test_without_buffer (void) { int result = 0; const size_t nbuf = 100; FILE *fp = fmemopen (NULL, nbuf, "w"); if (fp == NULL) { printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__); return 1; } static const char str[] = "hello world"; const size_t nstr = sizeof (str) - 1; /* Default write operation, check if file position is correct after it. */ fputs (str, fp); off_t o = ftello (fp); if (o != nstr) { printf ("FAIL: first ftello returned %jd, expected %zu\n", (intmax_t) o, nstr); result = 1; } if (fseeko (fp, 0, SEEK_END) != 0) { printf ("FAIL: fseeko failed\n"); result = 1; } o = ftello (fp); if (o != nstr) { printf ("FAIL: second ftello returned %jd, expected %zu\n", (intmax_t) o, nbuf); result = 1; } /* Rewind the stream and recheck by using a shorter string. */ rewind (fp); static const char str2[] = "just hello"; const size_t nstr2 = sizeof (str2) - 1; assert (nstr2 < nstr); fputs (str2, fp); o = ftello (fp); if (o != nstr2) { printf ("FAIL: third ftello returned %jd, expected %zu\n", (intmax_t) o, nstr2); result = 1; } fclose (fp); return result; } /* Check fmemopen with a buffer lenght of zero. */ static int do_test_length_zero (void) { int result = 0; FILE *fp; #define BUFCONTENTS "testing buffer" char buf[100] = BUFCONTENTS; const size_t nbuf = 0; int r; fp = fmemopen (buf, nbuf, "r"); if (fp == NULL) { printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__); return 1; } /* Reading any data on a zero-length buffer should return EOF. */ if ((r = fgetc (fp)) != EOF) { printf ("FAIL: fgetc on a zero-length returned: %d\n", r); result = 1; } off_t o = ftello (fp); if (o != 0) { printf ("FAIL: first ftello returned %jd, expected 0\n", (intmax_t) o); result = 1; } fclose (fp); /* Writing any data shall start at current position and shall not pass current buffer size beyond the size in fmemopen call. */ fp = fmemopen (buf, nbuf, "w"); if (fp == NULL) { printf ("FAIL: second fmemopen failed (%s)\n", __FUNCTION__); return 1; } static const char str[] = "hello world"; /* Because of buffering, the fputs call itself will not fail. However the final buffer should be not changed because length 0 was passed to the fmemopen call. */ fputs (str, fp); r = 0; errno = 0; if (fflush (fp) != EOF) { printf ("FAIL: fflush did not return EOF\n"); fclose (fp); return 1; } if (errno != ENOSPC) { printf ("FAIL: errno is %i (expected ENOSPC)\n", errno); fclose (fp); return 1; } fclose (fp); if (strcmp (buf, BUFCONTENTS) != 0) { printf ("FAIL: strcmp (%s, %s) failed\n", buf, BUFCONTENTS); return 1; } /* Different than 'w' mode, 'w+' truncates the buffer. */ fp = fmemopen (buf, nbuf, "w+"); if (fp == NULL) { printf ("FAIL: third fmemopen failed (%s)\n", __FUNCTION__); return 1; } fclose (fp); if (strcmp (buf, "") != 0) { printf ("FAIL: strcmp (%s, \"\") failed\n", buf); return 1; } return result; } static int do_test (void) { int ret = 0; ret += do_test_with_buffer (); ret += do_test_without_buffer (); ret += do_test_length_zero (); return ret; } #define TEST_FUNCTION do_test () #include "../test-skeleton.c"
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