+++ /dev/null
-/* Word-wrapping and line-truncating streams
- Copyright (C) 1997-1999,2001,2002,2003,2005 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Written by Miles Bader <miles@gnu.ai.mit.edu>.
-
- 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 3 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, see <http://www.gnu.org/licenses/>. */
-
-/* This package emulates glibc `line_wrap_stream' semantics for systems that
- don't have that. */
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <ctype.h>
-
-#include "argp-fmtstream.h"
-#include "argp-namefrob.h"
-
-#ifndef ARGP_FMTSTREAM_USE_LINEWRAP
-
-#ifndef isblank
-#define isblank(ch) ((ch)==' ' || (ch)=='\t')
-#endif
-
-#if defined _LIBC && defined USE_IN_LIBIO
-# include <wchar.h>
-# include <libio/libioP.h>
-# define __vsnprintf(s, l, f, a) _IO_vsnprintf (s, l, f, a)
-#endif
-
-#define INIT_BUF_SIZE 200
-#define PRINTF_SIZE_GUESS 150
-\f
-/* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
- written on it with LMARGIN spaces and limits them to RMARGIN columns
- total. If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
- replacing the whitespace before them with a newline and WMARGIN spaces.
- Otherwise, chars beyond RMARGIN are simply dropped until a newline.
- Returns NULL if there was an error. */
-argp_fmtstream_t
-__argp_make_fmtstream (FILE *stream,
- size_t lmargin, size_t rmargin, ssize_t wmargin)
-{
- argp_fmtstream_t fs;
-
- fs = (struct argp_fmtstream *) malloc (sizeof (struct argp_fmtstream));
- if (fs != NULL)
- {
- fs->stream = stream;
-
- fs->lmargin = lmargin;
- fs->rmargin = rmargin;
- fs->wmargin = wmargin;
- fs->point_col = 0;
- fs->point_offs = 0;
-
- fs->buf = (char *) malloc (INIT_BUF_SIZE);
- if (! fs->buf)
- {
- free (fs);
- fs = 0;
- }
- else
- {
- fs->p = fs->buf;
- fs->end = fs->buf + INIT_BUF_SIZE;
- }
- }
-
- return fs;
-}
-#if 0
-/* Not exported. */
-#ifdef weak_alias
-weak_alias (__argp_make_fmtstream, argp_make_fmtstream)
-#endif
-#endif
-
-/* Flush FS to its stream, and free it (but don't close the stream). */
-void
-__argp_fmtstream_free (argp_fmtstream_t fs)
-{
- __argp_fmtstream_update (fs);
- if (fs->p > fs->buf)
- {
-#ifdef USE_IN_LIBIO
- __fxprintf (fs->stream, "%.*s", (int) (fs->p - fs->buf), fs->buf);
-#else
- fwrite_unlocked (fs->buf, 1, fs->p - fs->buf, fs->stream);
-#endif
- }
- free (fs->buf);
- free (fs);
-}
-#if 0
-/* Not exported. */
-#ifdef weak_alias
-weak_alias (__argp_fmtstream_free, argp_fmtstream_free)
-#endif
-#endif
-\f
-/* Process FS's buffer so that line wrapping is done from POINT_OFFS to the
- end of its buffer. This code is mostly from glibc stdio/linewrap.c. */
-void
-__argp_fmtstream_update (argp_fmtstream_t fs)
-{
- char *buf, *nl;
- size_t len;
-
- /* Scan the buffer for newlines. */
- buf = fs->buf + fs->point_offs;
- while (buf < fs->p)
- {
- size_t r;
-
- if (fs->point_col == 0 && fs->lmargin != 0)
- {
- /* We are starting a new line. Print spaces to the left margin. */
- const size_t pad = fs->lmargin;
- if (fs->p + pad < fs->end)
- {
- /* We can fit in them in the buffer by moving the
- buffer text up and filling in the beginning. */
- memmove (buf + pad, buf, fs->p - buf);
- fs->p += pad; /* Compensate for bigger buffer. */
- memset (buf, ' ', pad); /* Fill in the spaces. */
- buf += pad; /* Don't bother searching them. */
- }
- else
- {
- /* No buffer space for spaces. Must flush. */
- size_t i;
- for (i = 0; i < pad; i++)
- {
-#ifdef USE_IN_LIBIO
- if (_IO_fwide (fs->stream, 0) > 0)
- putwc_unlocked (L' ', fs->stream);
- else
-#endif
- putc_unlocked (' ', fs->stream);
- }
- }
- fs->point_col = pad;
- }
-
- len = fs->p - buf;
- nl = memchr (buf, '\n', len);
-
- if (fs->point_col < 0)
- fs->point_col = 0;
-
- if (!nl)
- {
- /* The buffer ends in a partial line. */
-
- if (fs->point_col + len < fs->rmargin)
- {
- /* The remaining buffer text is a partial line and fits
- within the maximum line width. Advance point for the
- characters to be written and stop scanning. */
- fs->point_col += len;
- break;
- }
- else
- /* Set the end-of-line pointer for the code below to
- the end of the buffer. */
- nl = fs->p;
- }
- else if (fs->point_col + (nl - buf) < (ssize_t) fs->rmargin)
- {
- /* The buffer contains a full line that fits within the maximum
- line width. Reset point and scan the next line. */
- fs->point_col = 0;
- buf = nl + 1;
- continue;
- }
-
- /* This line is too long. */
- r = fs->rmargin - 1;
-
- if (fs->wmargin < 0)
- {
- /* Truncate the line by overwriting the excess with the
- newline and anything after it in the buffer. */
- if (nl < fs->p)
- {
- memmove (buf + (r - fs->point_col), nl, fs->p - nl);
- fs->p -= buf + (r - fs->point_col) - nl;
- /* Reset point for the next line and start scanning it. */
- fs->point_col = 0;
- buf += r + 1; /* Skip full line plus \n. */
- }
- else
- {
- /* The buffer ends with a partial line that is beyond the
- maximum line width. Advance point for the characters
- written, and discard those past the max from the buffer. */
- fs->point_col += len;
- fs->p -= fs->point_col - r;
- break;
- }
- }
- else
- {
- /* Do word wrap. Go to the column just past the maximum line
- width and scan back for the beginning of the word there.
- Then insert a line break. */
-
- char *p, *nextline;
- int i;
-
- p = buf + (r + 1 - fs->point_col);
- while (p >= buf && !isblank (*p))
- --p;
- nextline = p + 1; /* This will begin the next line. */
-
- if (nextline > buf)
- {
- /* Swallow separating blanks. */
- if (p >= buf)
- do
- --p;
- while (p >= buf && isblank (*p));
- nl = p + 1; /* The newline will replace the first blank. */
- }
- else
- {
- /* A single word that is greater than the maximum line width.
- Oh well. Put it on an overlong line by itself. */
- p = buf + (r + 1 - fs->point_col);
- /* Find the end of the long word. */
- if (p < nl)
- do
- ++p;
- while (p < nl && !isblank (*p));
- if (p == nl)
- {
- /* It already ends a line. No fussing required. */
- fs->point_col = 0;
- buf = nl + 1;
- continue;
- }
- /* We will move the newline to replace the first blank. */
- nl = p;
- /* Swallow separating blanks. */
- do
- ++p;
- while (isblank (*p));
- /* The next line will start here. */
- nextline = p;
- }
-
- /* Note: There are a bunch of tests below for
- NEXTLINE == BUF + LEN + 1; this case is where NL happens to fall
- at the end of the buffer, and NEXTLINE is in fact empty (and so
- we need not be careful to maintain its contents). */
-
- if ((nextline == buf + len + 1
- ? fs->end - nl < fs->wmargin + 1
- : nextline - (nl + 1) < fs->wmargin)
- && fs->p > nextline)
- {
- /* The margin needs more blanks than we removed. */
- if (fs->end - fs->p > fs->wmargin + 1)
- /* Make some space for them. */
- {
- size_t mv = fs->p - nextline;
- memmove (nl + 1 + fs->wmargin, nextline, mv);
- nextline = nl + 1 + fs->wmargin;
- len = nextline + mv - buf;
- *nl++ = '\n';
- }
- else
- /* Output the first line so we can use the space. */
- {
-#ifdef _LIBC
- __fxprintf (fs->stream, "%.*s\n",
- (int) (nl - fs->buf), fs->buf);
-#else
- if (nl > fs->buf)
- fwrite_unlocked (fs->buf, 1, nl - fs->buf, fs->stream);
- putc_unlocked ('\n', fs->stream);
-#endif
-
- len += buf - fs->buf;
- nl = buf = fs->buf;
- }
- }
- else
- /* We can fit the newline and blanks in before
- the next word. */
- *nl++ = '\n';
-
- if (nextline - nl >= fs->wmargin
- || (nextline == buf + len + 1 && fs->end - nextline >= fs->wmargin))
- /* Add blanks up to the wrap margin column. */
- for (i = 0; i < fs->wmargin; ++i)
- *nl++ = ' ';
- else
- for (i = 0; i < fs->wmargin; ++i)
-#ifdef USE_IN_LIBIO
- if (_IO_fwide (fs->stream, 0) > 0)
- putwc_unlocked (L' ', fs->stream);
- else
-#endif
- putc_unlocked (' ', fs->stream);
-
- /* Copy the tail of the original buffer into the current buffer
- position. */
- if (nl < nextline)
- memmove (nl, nextline, buf + len - nextline);
- len -= nextline - buf;
-
- /* Continue the scan on the remaining lines in the buffer. */
- buf = nl;
-
- /* Restore bufp to include all the remaining text. */
- fs->p = nl + len;
-
- /* Reset the counter of what has been output this line. If wmargin
- is 0, we want to avoid the lmargin getting added, so we set
- point_col to a magic value of -1 in that case. */
- fs->point_col = fs->wmargin ? fs->wmargin : -1;
- }
- }
-
- /* Remember that we've scanned as far as the end of the buffer. */
- fs->point_offs = fs->p - fs->buf;
-}
-\f
-/* Ensure that FS has space for AMOUNT more bytes in its buffer, either by
- growing the buffer, or by flushing it. True is returned iff we succeed. */
-int
-__argp_fmtstream_ensure (struct argp_fmtstream *fs, size_t amount)
-{
- if ((size_t) (fs->end - fs->p) < amount)
- {
- ssize_t wrote;
-
- /* Flush FS's buffer. */
- __argp_fmtstream_update (fs);
-
-#ifdef _LIBC
- __fxprintf (fs->stream, "%.*s", (int) (fs->p - fs->buf), fs->buf);
- wrote = fs->p - fs->buf;
-#else
- wrote = fwrite_unlocked (fs->buf, 1, fs->p - fs->buf, fs->stream);
-#endif
- if (wrote == fs->p - fs->buf)
- {
- fs->p = fs->buf;
- fs->point_offs = 0;
- }
- else
- {
- fs->p -= wrote;
- fs->point_offs -= wrote;
- memmove (fs->buf, fs->buf + wrote, fs->p - fs->buf);
- return 0;
- }
-
- if ((size_t) (fs->end - fs->buf) < amount)
- /* Gotta grow the buffer. */
- {
- size_t old_size = fs->end - fs->buf;
- size_t new_size = old_size + amount;
- char *new_buf;
-
- if (new_size < old_size || ! (new_buf = realloc (fs->buf, new_size)))
- {
- __set_errno (ENOMEM);
- return 0;
- }
-
- fs->buf = new_buf;
- fs->end = new_buf + new_size;
- fs->p = fs->buf;
- }
- }
-
- return 1;
-}
-\f
-ssize_t
-__argp_fmtstream_printf (struct argp_fmtstream *fs, const char *fmt, ...)
-{
- int out;
- size_t avail;
- size_t size_guess = PRINTF_SIZE_GUESS; /* How much space to reserve. */
-
- do
- {
- va_list args;
-
- if (! __argp_fmtstream_ensure (fs, size_guess))
- return -1;
-
- va_start (args, fmt);
- avail = fs->end - fs->p;
- out = __vsnprintf (fs->p, avail, fmt, args);
- va_end (args);
- if ((size_t) out >= avail)
- size_guess = out + 1;
- }
- while ((size_t) out >= avail);
-
- fs->p += out;
-
- return out;
-}
-#if 0
-/* Not exported. */
-#ifdef weak_alias
-weak_alias (__argp_fmtstream_printf, argp_fmtstream_printf)
-#endif
-#endif
-
-#endif /* !ARGP_FMTSTREAM_USE_LINEWRAP */
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