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/*
* bodyio.cc: Part of GNU CSSC.
*
*
* Copyright (C) 1997,1998,1999,2001 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, USA.
*
*
* Code for performing I/O on the body of an SCCS file.
* See also sf-admin.cc and encoding.cc.
*
*/
#include "cssc.h"
#include "filepos.h"
#include "bodyio.h"
#include "sccsfile.h"
#include "linebuf.h"
#include "except.h"
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
/* Check if we have exceeded the maximum line length.
*/
static bool check_line_len(const char *iname,
long int len_max,
int column,
int ch,
FILE *in,
bool *binary)
{
if (0 == len_max || column < len_max)
{
return true; // no maximum.
}
else
{
ungetc(ch, in); // push back the character.
if (binary_file_creation_allowed())
{
errormsg("%s: line length exceeds %ld characters, "
"treating as binary.\n",
iname, len_max );
*binary = true;
}
else
{
errormsg("%s: line length exceeds %d characters, "
"and binary file support is disabled.\n",
iname, len_max );
}
return false;
}
}
/* body_insert_text()
*
* Insert a file into an SCCS file (e.g. for admin).
* return false (and restore initial file positions)
* for failure.
*
* We fail if the input contains a ^A immediately following
* a newline (which is special to SCCS), or if the input
* does not end with a newline.
*
* 1) otherwise the control-character (^A) immediately
* following will not be recognised; SCCS utils
* only look for them at the beginning of a line
*
* 2) many diff(1) programs only cope with text files
* that end with a newline.
*/
bool
body_insert_text(const char iname[], const char oname[],
FILE *in, FILE *out,
unsigned long int *lines,
bool *idkw,
bool *binary,
bool *io_failure)
{
int ch, last;
unsigned long int nl; // number of lines.
const long int len_max = max_sfile_line_len();
bool found_id;
int column; // current column in ouutput file.
// If we fail, rewind these files to try binary encoding.
FilePosSaver o_saver(out);
*idkw = found_id = false;
nl = 0uL;
last = '\n';
*io_failure = false;
// Make sure we don't already think it is binary -- if so, this
// function should never have been called.
ASSERT(false == *binary);
column = 0;
while ( EOF != (ch=getc(in)) )
{
if (CONFIG_EOL_CHARACTER == ch)
++nl;
// check for ^A at start of line.
if ('\n' == last)
{
column = 0;
if ('\001' == ch)
{
errormsg("%s: control character at start of line, "
"treating as binary.\n",
iname);
ungetc(ch, in); // push back the control character.
*binary = true;
return false; // output file pointer implicitly rewound
}
}
else
{
++column;
if (!check_line_len(iname, len_max, ++column, ch, in, binary))
{
return false; // output file pointer implicitly rewound
}
}
// FIXME TODO: if we get "disk full" while trying to write the
// body of an SCCS file, we will retry with binary (which of
// course uses even more space)
if (putc_failed(putc(ch, out)))
{
errormsg_with_errno("%s: Write error.", oname);
*io_failure = true;
return false;
}
if (!found_id) // Check for ID keywords.
{
if ('%' == last && is_id_keyword_letter(ch))
{
const int peek = getc(in);
if ('%' == peek)
*idkw = found_id = true;
if (EOF != peek) // Can't put the genie back in the bottle!
ungetc(peek, in);
}
}
last = ch;
}
if (ferror(in))
{
errormsg_with_errno("%s: Read error.", iname);
*io_failure = true;
return false;
}
// Make sure the file ended with a newline.
if ('\n' != last)
{
errormsg("%s: no newline at end of file, treating as binary\n",
iname);
*binary = true;
return false; // file pointers implicitly rewound
}
// Success; do not rewind the output file.
o_saver.disarm();
*lines = nl;
return true;
}
// Keywords: a file containing the octal characters
// 0026 0021 0141 (hex 0x16 0x11 0x61) will produce
// begin 0644 x
// #%A%A
// `
// end
//
//
// Stupidly imho, SCCS checks the ENCODED form of the file
// in order to support the "no ID keywords" warning. Still,
// at least it doesn't expand those on output!
bool
body_insert_binary(const char iname[], const char oname[],
FILE *in, FILE *out,
unsigned long int *lines,
bool *idkw)
{
const int max_chunk = 45;
char inbuf[max_chunk], outbuf[80];
unsigned long int nl;
int len;
bool kw;
*idkw = kw = false;
nl = 0;
while ( 0 < (len = fread(inbuf, sizeof(char), max_chunk, in)) )
{
encode_line(inbuf, outbuf, len); // see encoding.cc.
if (!kw)
{
// For some odd reason, SCCS seems to check
// the encoded form for ID keywords! We know
// that strlen() on the UUENCODEd data is safe.
if (check_id_keywords(outbuf, strlen(outbuf))) // XXX used to check inbuf
*idkw = kw = true;
}
if (fputs_failed(fputs(outbuf, out)))
{
errormsg_with_errno("%s: Write error.", oname);
return false;
}
++nl;
}
// A space character indicates a count of zero bytes and hence
// the end of the encoded file.
if (fputs_failed(fputs(" \n", out)))
{
errormsg_with_errno("%s: Write error.", oname);
return false;
}
++nl;
if (ferror(in))
{
errormsg_with_errno("%s: Read error.", iname);
return false;
}
*lines = nl;
return true;
}
bool
copy_data(FILE *in, FILE *out)
{
char buf[BUFSIZ];
size_t n, nout;
while ( 0u < (n=fread(buf, 1, BUFSIZ, in)))
{
nout = fwrite(buf, 1, n, out);
if (nout < n)
{
errormsg_with_errno("copy_data: write error.");
return false;
}
}
if (ferror(in))
{
errormsg_with_errno("copy_data: read error.");
return false;
}
else
{
return true; // success
}
}
bool
body_insert(bool *binary,
const char iname[], const char oname[],
FILE *in, FILE *out,
unsigned long int *lines,
bool *idkw)
{
// If binary mode has not been forced, try text mode.
if (*binary)
{
return body_insert_binary(iname, oname, in, out, lines, idkw);
}
else
{
// body_insert_text() takes care of rewinding the output
// file; we may not even be able to rewind the input file.
bool io_failure = false;
if (body_insert_text(iname, oname, in, out, lines, idkw, binary,
&io_failure))
{
return true; // Success.
}
else
{
if (io_failure)
return false;
if (!binary_file_creation_allowed())
{
// We can't try again with a binary file, because that
// feature is disabled.
return false;
}
// It wasn't text after all. We may be reading from
// stdin, so we can't seek on it. But we have
// the first segment of the file written to the x-file
// already, and the remainder is still waiting to be
// read, so we can recover all the data.
*binary = true;
FILE *tmp = tmpfile();
if (tmp)
{
bool ret = true;
#ifdef HAVE_EXCEPTIONS
try
{
#endif
// Recover the data already written to the output
// file and then rewind it, so that we can overwrite
// it with the encoded version.
FilePosSaver *fp_out = new FilePosSaver(out);
if (copy_data(out, tmp) && copy_data(in, tmp))
{
delete fp_out; // rewind the file OUT.
rewind(tmp);
ret = body_insert_binary("temporary file",
oname, tmp, out, lines, idkw);
}
else
{
ret = false;
}
#ifdef HAVE_EXCEPTIONS
}
catch (CsscException)
{
fclose(tmp);
throw;
}
#endif
fclose(tmp);
return ret;
}
else
{
errormsg_with_errno("Could not create temporary file\n");
return false;
}
}
}
}
int output_body_line_text(FILE *fp, const cssc_linebuf* plb)
{
return plb->write(fp) || fputc_failed(fputc('\n', fp));
}
int output_body_line_binary(FILE *fp, const cssc_linebuf* plb)
{
// Curiously, if the file is encoded, we know that
// the encoded form is only about 60 characters
// and contains no 8-bit or zero data.
size_t n;
char outbuf[80];
n = decode_line(plb->c_str(), outbuf); // see encoding.cc
return fwrite_failed(fwrite(outbuf, sizeof(char), n, fp), n);
}
int
encode_file(const char *nin, const char *nout)
{
int retval = 0;
FILE *fin = fopen_as_real_user(nin, "rb"); // binary
if (0 == fin)
{
errormsg_with_errno("Failed to open \"%s\" for reading.\n", nin);
return -1;
}
// FILE *fout = fopen(nout, "w"); // text
FILE *fout = fcreate(nout, CREATE_EXCLUSIVE); // text
if (0 == fout)
{
errormsg_with_errno("Failed to open \"%s\" for writing.\n", nout);
retval = -1;
}
else
{
#ifdef HAVE_EXCEPTIONS
try
{
#endif
encode_stream(fin, fout);
if (ferror(fin) || fclose_failed(fclose(fin)))
{
errormsg_with_errno("%s: Read error.\n", nin);
retval = -1;
}
else
{
if (ferror(fout) || fclose_failed(fclose(fout)))
{
errormsg_with_errno("%s: Write error.\n", nout);
retval = -1;
}
}
#ifdef HAVE_EXCEPTIONS
}
catch (CsscException)
{
remove(nout);
throw;
}
#endif
if (0 != retval)
remove(nout);
}
return retval;
}
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