diff options
Diffstat (limited to 'gettext-tools/lib/getline.c')
-rw-r--r-- | gettext-tools/lib/getline.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/gettext-tools/lib/getline.c b/gettext-tools/lib/getline.c new file mode 100644 index 0000000..29efa27 --- /dev/null +++ b/gettext-tools/lib/getline.c @@ -0,0 +1,146 @@ +/* getline.c -- Replacement for GNU C library function getline + +Copyright (C) 1993, 1996, 2001, 2002 Free Software Foundation, Inc. + +This program is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This program 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 +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +/* Specification. */ +#include "getline.h" + +/* The `getdelim' function is only declared if the following symbol + is defined. */ +#ifndef _GNU_SOURCE +# define _GNU_SOURCE 1 +#endif +#include <stdio.h> +#include <sys/types.h> + +#if defined __GNU_LIBRARY__ && HAVE_GETDELIM + +int +getline (char **lineptr, size_t *n, FILE *stream) +{ + return getdelim (lineptr, n, '\n', stream); +} + +#else /* ! have getdelim */ + +# include <assert.h> + +# if HAVE_STDLIB_H +# include <stdlib.h> +# else +extern char *malloc (); +extern char *realloc (); +# endif + +/* Always add at least this many bytes when extending the buffer. */ +# define MIN_CHUNK 64 + +/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR + + OFFSET (and null-terminate it). *LINEPTR is a pointer returned from + malloc (or NULL), pointing to *N characters of space. It is realloc'd + as necessary. Return the number of characters read (not including the + null terminator), or -1 on error or EOF. + NOTE: There is another getstr() function declared in <curses.h>. */ + +static int +getstr (char **lineptr, size_t *n, FILE *stream, char terminator, + size_t offset) +{ + int nchars_avail; /* Allocated but unused chars in *LINEPTR. */ + char *read_pos; /* Where we're reading into *LINEPTR. */ + int ret; + + if (!lineptr || !n || !stream) + return -1; + + if (!*lineptr) + { + *n = MIN_CHUNK; + *lineptr = malloc (*n); + if (!*lineptr) + return -1; + } + + nchars_avail = *n - offset; + read_pos = *lineptr + offset; + + for (;;) + { + register int c = getc (stream); + + /* We always want at least one char left in the buffer, since we + always (unless we get an error while reading the first char) + NUL-terminate the line buffer. */ + + assert(*n - nchars_avail == read_pos - *lineptr); + if (nchars_avail < 2) + { + if (*n > MIN_CHUNK) + *n *= 2; + else + *n += MIN_CHUNK; + + nchars_avail = *n + *lineptr - read_pos; + *lineptr = realloc (*lineptr, *n); + if (!*lineptr) + return -1; + read_pos = *n - nchars_avail + *lineptr; + assert(*n - nchars_avail == read_pos - *lineptr); + } + + if (c == EOF || ferror (stream)) + { + /* Return partial line, if any. */ + if (read_pos == *lineptr) + return -1; + else + break; + } + + *read_pos++ = c; + nchars_avail--; + + if (c == terminator) + /* Return the line. */ + break; + } + + /* Done - NUL terminate and return the number of chars read. */ + *read_pos = '\0'; + + ret = read_pos - (*lineptr + offset); + return ret; +} + +int +getline (char **lineptr, size_t *n, FILE *stream) +{ + return getstr (lineptr, n, stream, '\n', 0); +} + +int +getdelim (char **lineptr, size_t *n, int delimiter, FILE *stream) +{ + return getstr (lineptr, n, stream, delimiter, 0); +} +#endif |