diff options
Diffstat (limited to 'nuttx/libc/stdio/lib_fgets.c')
-rw-r--r-- | nuttx/libc/stdio/lib_fgets.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/nuttx/libc/stdio/lib_fgets.c b/nuttx/libc/stdio/lib_fgets.c new file mode 100644 index 000000000..a4f9089ed --- /dev/null +++ b/nuttx/libc/stdio/lib_fgets.c @@ -0,0 +1,207 @@ +/**************************************************************************** + * lib/stdio/lib_fgets.c + * + * Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdbool.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <ctype.h> +#include <debug.h> + +/**************************************************************************** + * Definitions + ****************************************************************************/ +/* Some environments may return CR as end-of-line, others LF, and others + * both. If not specified, the logic here assumes either (but not both) as + * the default. + */ + +#if defined(CONFIG_EOL_IS_CR) +# undef CONFIG_EOL_IS_LF +# undef CONFIG_EOL_IS_BOTH_CRLF +# undef CONFIG_EOL_IS_EITHER_CRLF +#elif defined(CONFIG_EOL_IS_LF) +# undef CONFIG_EOL_IS_CR +# undef CONFIG_EOL_IS_BOTH_CRLF +# undef CONFIG_EOL_IS_EITHER_CRLF +#elif defined(CONFIG_EOL_IS_BOTH_CRLF) +# undef CONFIG_EOL_IS_CR +# undef CONFIG_EOL_IS_LF +# undef CONFIG_EOL_IS_EITHER_CRLF +#elif defined(CONFIG_EOL_IS_EITHER_CRLF) +# undef CONFIG_EOL_IS_CR +# undef CONFIG_EOL_IS_LF +# undef CONFIG_EOL_IS_BOTH_CRLF +#else +# undef CONFIG_EOL_IS_CR +# undef CONFIG_EOL_IS_LF +# undef CONFIG_EOL_IS_BOTH_CRLF +# define CONFIG_EOL_IS_EITHER_CRLF 1 +#endif + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: fgets + * + * Description: + * fgets() reads in at most one less than 'buflen' characters from stream + * and stores them into the buffer pointed to by 'buf'. Reading stops after + * an EOF or a newline. If a newline is read, it is stored into the + * buffer. A null terminator is stored after the last character in the + * buffer. + * + **************************************************************************/ + +char *fgets(FAR char *buf, int buflen, FILE *stream) +{ + int nch = 0; + + /* Sanity checks */ + + if (!stream || !buf || buflen < 1 || stream->fs_filedes < 0) + { + return NULL; + } + + if (buflen < 2) + { + *buf = '\0'; + return buf; + } + + /* Read characters until we have a full line. On each the loop we must + * be assured that there are two free bytes in the line buffer: One for + * the next character and one for the null terminator. + */ + + for(;;) + { + /* Get the next character */ + + int ch = fgetc(stream); + + /* Check for end-of-line. This is tricky only in that some + * environments may return CR as end-of-line, others LF, and + * others both. + */ + +#if defined(CONFIG_EOL_IS_LF) || defined(CONFIG_EOL_IS_BOTH_CRLF) + if (ch == '\n') +#elif defined(CONFIG_EOL_IS_CR) + if (ch == '\r') +#elif CONFIG_EOL_IS_EITHER_CRLF + if (ch == '\n' || ch == '\r') +#endif + { + /* The newline is stored in the buffer along with the null + * terminator. + */ + + buf[nch++] = '\n'; + buf[nch] = '\0'; + return buf; + } + + /* Check for end-of-file */ + + else if (ch == EOF) + { + /* End of file with no data? */ + + if (!nch) + { + /* Yes.. return NULL as the end of file mark */ + + return NULL; + } + else + { + /* Terminate the line */ + + buf[nch] = '\0'; + return buf; + } + } + + /* Otherwise, check if the character is printable and, if so, put the + * character in the line buffer + */ + + else if (isprint(ch)) + { + buf[nch++] = ch; + + /* Check if there is room for another character and the line's + * null terminator. If not then we have to end the line now. + */ + + if (nch + 1 >= buflen) + { + buf[nch] = '\0'; + return buf; + } + } + } +} + |