diff options
Diffstat (limited to 'libio')
| -rw-r--r-- | libio/Makefile | 4 | ||||
| -rw-r--r-- | libio/Versions | 1 | ||||
| -rw-r--r-- | libio/readline.c | 170 | ||||
| -rw-r--r-- | libio/tst-readline.c | 237 |
4 files changed, 2 insertions, 410 deletions
diff --git a/libio/Makefile b/libio/Makefile index 926df1870b..4f0f777bbb 100644 --- a/libio/Makefile +++ b/libio/Makefile @@ -49,7 +49,7 @@ routines := \ __fbufsize __freading __fwriting __freadable __fwritable __flbf \ __fpurge __fpending __fsetlocking \ \ - libc_fatal fmemopen oldfmemopen vtables readline + libc_fatal fmemopen oldfmemopen vtables tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \ tst_wprintf2 tst-widetext test-fmemopen tst-ext tst-ext2 \ @@ -68,7 +68,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \ tst-sprintf-ub tst-sprintf-chk-ub tst-bz24051 tst-bz24153 \ tst-wfile-sync -tests-internal = tst-vtables tst-vtables-interposed tst-readline +tests-internal = tst-vtables tst-vtables-interposed ifeq (yes,$(build-shared)) # Add test-fopenloc only if shared library is enabled since it depends on diff --git a/libio/Versions b/libio/Versions index acb896afa9..6f1ab96100 100644 --- a/libio/Versions +++ b/libio/Versions @@ -161,6 +161,5 @@ libc { __fseeko64; __ftello64; - __libc_readline_unlocked; } } diff --git a/libio/readline.c b/libio/readline.c deleted file mode 100644 index 99fecc5825..0000000000 --- a/libio/readline.c +++ /dev/null @@ -1,170 +0,0 @@ -/* fgets with ERANGE error reporting and size_t buffer length. - Copyright (C) 2018-2020 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 - <https://www.gnu.org/licenses/>. */ - -#include <assert.h> -#include <errno.h> -#include <stdio.h> -#include <string.h> - -#include "libioP.h" - -/* Return -1 and set errno to EINVAL if it is ERANGE. */ -static ssize_t -fail_no_erange (void) -{ - if (errno == ERANGE) - __set_errno (EINVAL); - return -1; -} - -/* Slow path for reading the line. Called with no data in the stream - read buffer. Write data to [BUFFER, BUFFER_END). */ -static ssize_t -readline_slow (FILE *fp, char *buffer, char *buffer_end) -{ - char *start = buffer; - - while (buffer < buffer_end) - { - if (__underflow (fp) == EOF) - { - if (_IO_ferror_unlocked (fp)) - /* If the EOF was caused by a read error, report it. */ - return fail_no_erange (); - *buffer = '\0'; - /* Do not include the null terminator. */ - return buffer - start; - } - - /* __underflow has filled the buffer. */ - char *readptr = fp->_IO_read_ptr; - ssize_t readlen = fp->_IO_read_end - readptr; - /* Make sure that __underflow really has acquired some data. */ - assert (readlen > 0); - char *pnl = memchr (readptr, '\n', readlen); - if (pnl != NULL) - { - /* We found the terminator. */ - size_t line_length = pnl - readptr; - if (line_length + 2 > buffer_end - buffer) - /* Not enough room in the caller-supplied buffer. */ - break; - memcpy (buffer, readptr, line_length + 1); - buffer[line_length + 1] = '\0'; - fp->_IO_read_ptr = pnl + 1; - /* Do not include the null terminator. */ - return buffer - start + line_length + 1; - } - - if (readlen >= buffer_end - buffer) - /* Not enough room in the caller-supplied buffer. */ - break; - - /* Save and consume the stream buffer. */ - memcpy (buffer, readptr, readlen); - fp->_IO_read_ptr = fp->_IO_read_end; - buffer += readlen; - } - - /* The line does not fit into the buffer. */ - __set_errno (ERANGE); - return -1; -} - -ssize_t -__libc_readline_unlocked (FILE *fp, char *buffer, size_t buffer_length) -{ - char *buffer_end = buffer + buffer_length; - - /* Orient the stream. */ - if (__builtin_expect (fp->_mode, -1) == 0) - _IO_fwide (fp, -1); - - /* Fast path: The line terminator is found in the buffer. */ - char *readptr = fp->_IO_read_ptr; - ssize_t readlen = fp->_IO_read_end - readptr; - off64_t start_offset; /* File offset before reading anything. */ - if (readlen > 0) - { - char *pnl = memchr (readptr, '\n', readlen); - if (pnl != NULL) - { - size_t line_length = pnl - readptr; - /* Account for line and null terminators. */ - if (line_length + 2 > buffer_length) - { - __set_errno (ERANGE); - return -1; - } - memcpy (buffer, readptr, line_length + 1); - buffer[line_length + 1] = '\0'; - /* Consume the entire line. */ - fp->_IO_read_ptr = pnl + 1; - return line_length + 1; - } - - /* If the buffer does not have enough space for what is pending - in the stream (plus a NUL terminator), the buffer is too - small. */ - if (readlen + 1 > buffer_length) - { - __set_errno (ERANGE); - return -1; - } - - /* End of line not found. We need all the buffered data. Fall - through to the slow path. */ - memcpy (buffer, readptr, readlen); - buffer += readlen; - /* The original length is invalid after this point. Use - buffer_end instead. */ -#pragma GCC poison buffer_length - /* Read the old offset before updating the read pointer. */ - start_offset = __ftello64 (fp); - fp->_IO_read_ptr = fp->_IO_read_end; - } - else - { - readlen = 0; - start_offset = __ftello64 (fp); - } - - /* Slow path: Read more data from the underlying file. We need to - restore the file pointer if the buffer is too small. First, - check if the __ftello64 call above failed. */ - if (start_offset < 0) - return fail_no_erange (); - - ssize_t result = readline_slow (fp, buffer, buffer_end); - if (result < 0) - { - if (errno == ERANGE) - { - /* Restore the file pointer so that the caller may read the - same line again. */ - if (__fseeko64 (fp, start_offset, SEEK_SET) < 0) - return fail_no_erange (); - __set_errno (ERANGE); - } - /* Do not restore the file position on other errors; it is - likely that the __fseeko64 call would fail, too. */ - return -1; - } - return readlen + result; -} -libc_hidden_def (__libc_readline_unlocked) diff --git a/libio/tst-readline.c b/libio/tst-readline.c deleted file mode 100644 index 40663ed77f..0000000000 --- a/libio/tst-readline.c +++ /dev/null @@ -1,237 +0,0 @@ -/* Test the __libc_readline_unlocked function. - Copyright (C) 2018-2020 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 - <https://www.gnu.org/licenses/>. */ - -/* Exercise __libc_readline_unlocked with various combinations of line - lengths, stdio buffer sizes, and line read buffer sizes. */ - -#include <errno.h> -#include <stdbool.h> -#include <stdio.h> -#include <string.h> -#include <support/check.h> -#include <support/support.h> -#include <support/temp_file.h> -#include <support/test-driver.h> -#include <support/xmemstream.h> -#include <support/xstdio.h> -#include <support/xunistd.h> - -enum - { - maximum_line_length = 7, - number_of_lines = 3, - }; - -/* -1: Do not set buffer size. 0: unbuffered. Otherwise, use this as - the size of the buffer. */ -static int buffer_size; - -/* These size of the buffer used for reading. Must be at least 2. */ -static int read_size; - -/* If a read files with ERANGE, increase the buffer size by this - amount. Must be positive. */ -static int read_size_increment; - -/* If non-zero, do not reset the read size after an ERANGE error. */ -static int read_size_preserve; - -/* If non-zero, no '\n' at the end of the file. */ -static int no_newline_at_eof; - -/* Length of the line, or -1 if the line is not present. */ -static int line_lengths[number_of_lines]; - -/* The name of the test file. */ -static char *test_file_path; - -/* The contents of the test file. */ -static char expected_contents[(maximum_line_length + 2) * number_of_lines + 1]; -static size_t expected_length; - -/* Returns a random byte which is not zero or the line terminator. */ -static char -random_char (void) -{ - static unsigned int rand_state = 1; - while (true) - { - char result = rand_r (&rand_state) >> 16; - if (result != 0 && result != '\n') - return result; - } -} - -/* Create the test file. */ -static void -prepare (int argc, char **argv) -{ - int fd = create_temp_file ("tst-readline-", &test_file_path); - TEST_VERIFY_EXIT (fd >= 0); - xclose (fd); -} - -/* Prepare the test file. Return false if the test parameters are - incongruent and the test should be skipped. */ -static bool -write_test_file (void) -{ - expected_length = 0; - char *p = expected_contents; - for (int lineno = 0; lineno < number_of_lines; ++lineno) - for (int i = 0; i < line_lengths[lineno]; ++i) - *p++ = random_char (); - expected_length = p - &expected_contents[0]; - if (no_newline_at_eof) - { - if (expected_length == 0) - return false; - --expected_length; - --p; - } - if (test_verbose > 0) - { - printf ("info: writing test file of %zu bytes:\n", expected_length); - for (int i = 0; i < number_of_lines; ++i) - printf (" line %d: %d\n", i, line_lengths[i]); - if (no_newline_at_eof) - puts (" (no newline at EOF)"); - } - TEST_VERIFY_EXIT (expected_length < sizeof (expected_contents)); - *p++ = '\0'; - support_write_file_string (test_file_path, expected_contents); - return true; -} - -/* Run a single test (a combination of a test file and read - parameters). */ -static void -run_test (void) -{ - TEST_VERIFY_EXIT (read_size_increment > 0); - if (test_verbose > 0) - { - printf ("info: running test: buffer_size=%d read_size=%d\n" - " read_size_increment=%d read_size_preserve=%d\n", - buffer_size, read_size, read_size_increment, read_size_preserve); - } - - struct xmemstream result; - xopen_memstream (&result); - - FILE *fp = xfopen (test_file_path, "rce"); - char *fp_buffer = NULL; - if (buffer_size == 0) - TEST_VERIFY_EXIT (setvbuf (fp, NULL, _IONBF, 0) == 0); - if (buffer_size > 0) - { - fp_buffer = xmalloc (buffer_size); - TEST_VERIFY_EXIT (setvbuf (fp, fp_buffer, _IOFBF, buffer_size) == 0); - } - - char *line_buffer = xmalloc (read_size); - size_t line_buffer_size = read_size; - - while (true) - { - ssize_t ret = __libc_readline_unlocked - (fp, line_buffer, line_buffer_size); - if (ret < 0) - { - TEST_VERIFY (ret == -1); - if (errno != ERANGE) - FAIL_EXIT1 ("__libc_readline_unlocked: %m"); - line_buffer_size += read_size_increment; - free (line_buffer); - line_buffer = xmalloc (line_buffer_size); - /* Try reading this line again. */ - } - else if (ret == 0) - break; - else - { - /* A line has been read. Save it. */ - TEST_VERIFY (ret == strlen (line_buffer)); - const char *pnl = strchr (line_buffer, '\n'); - /* If there is a \n, it must be at the end. */ - TEST_VERIFY (pnl == NULL || pnl == line_buffer + ret - 1); - fputs (line_buffer, result.out); - - /* Restore the original read size if required. */ - if (line_buffer_size > read_size && !read_size_preserve) - { - line_buffer_size = read_size; - free (line_buffer); - line_buffer = xmalloc (line_buffer_size); - } - } - } - - xfclose (fp); - free (fp_buffer); - free (line_buffer); - - xfclose_memstream (&result); - TEST_VERIFY (result.length == expected_length); - TEST_VERIFY (strcmp (result.buffer, expected_contents) == 0); - if (test_verbose > 0) - { - printf ("info: expected (%zu): [[%s]]\n", - expected_length, expected_contents); - printf ("info: actual (%zu): [[%s]]\n", result.length, result.buffer); - } - free (result.buffer); -} - -/* Test one test file with multiple read parameters. */ -static void -test_one_file (void) -{ - for (buffer_size = -1; buffer_size <= maximum_line_length + 1; ++buffer_size) - for (read_size = 2; read_size <= maximum_line_length + 2; ++read_size) - for (read_size_increment = 1; read_size_increment <= 4; - ++read_size_increment) - for (read_size_preserve = 0; read_size_preserve < 2; - ++read_size_preserve) - run_test (); -} - - -static int -do_test (void) -{ - /* Set up the test file contents. */ - for (line_lengths[0] = -1; line_lengths[0] <= maximum_line_length; - ++line_lengths[0]) - for (line_lengths[1] = -1; line_lengths[1] <= maximum_line_length; - ++line_lengths[1]) - for (line_lengths[2] = -1; line_lengths[2] <= maximum_line_length; - ++line_lengths[2]) - for (no_newline_at_eof = 0; no_newline_at_eof < 2; ++no_newline_at_eof) - { - if (!write_test_file ()) - continue; - test_one_file (); - } - free (test_file_path); - return 0; -} - -#define TIMEOUT 100 -#define PREPARE prepare -#include <support/test-driver.c> |