mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
db77e29a23
Converted all ASCII tabs to ASCII spaces using a 8 character tab stop, for all files, except for all Makefiles (plus rpm.mk). The `git diff -w` reports no changes.
122 lines
3.3 KiB
Plaintext
122 lines
3.3 KiB
Plaintext
/*
|
|
* write2file - write results to file
|
|
*
|
|
* This resource file serves as an example of how to perform file I/O.
|
|
* This write2file hows how to perform file I/O and is provided as
|
|
* an illustrative example.
|
|
*
|
|
* Copyright (C) 2023 Landon Curt Noll
|
|
*
|
|
* Calc is open software; you can redistribute it and/or modify it under
|
|
* the terms of the version 2.1 of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* Calc 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.
|
|
*
|
|
* A copy of version 2.1 of the GNU Lesser General Public License is
|
|
* distributed with calc under the filename COPYING-LGPL. You should have
|
|
* received a copy with calc; if not, write to Free Software Foundation, Inc.
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Under source code control: 2023/08/20 13:13:11
|
|
* File existed as early as: 2023
|
|
*
|
|
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
|
|
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
|
|
*/
|
|
|
|
|
|
static outfilename; /* where to write stuff */
|
|
static outfile; /* open file stream on which to write */
|
|
static stderr; /* write errors to standard error */
|
|
|
|
|
|
/*
|
|
* setup
|
|
*/
|
|
if (!isstr(outfilename)) {
|
|
outfilename = "./outfile";
|
|
}
|
|
if (!isfile(stderr)) {
|
|
stderr = files(2);
|
|
if (!isfile(stderr)) {
|
|
printf("Warning: stderr as files(2) is not a file!\n");
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* try to create or open and truncate the outfile
|
|
*/
|
|
if (!isfile(outfile)) {
|
|
/* open outfilename for writing at the beginning */
|
|
outfile = fopen(outfilename, "w");
|
|
|
|
/* firewall - check for failing to open */
|
|
if (!isfile(outfile)) {
|
|
fprintf(stderr, "failed to open: %s error(%d): %s\n", outfilename, errno(outfile), strerror(outfile));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* write a value to a file given a format
|
|
*/
|
|
define w2f(filename, stream, fmt, value) {
|
|
|
|
/* firewall */
|
|
if (!isfile(stderr)) {
|
|
printf("stderr is not an open file\n");
|
|
return;
|
|
}
|
|
if (!isstr(filename)) {
|
|
fprintf(stderr, "filename argument is not a string\n");
|
|
return;
|
|
}
|
|
if (!isfile(stream)) {
|
|
fprintf(stderr, "stream argument is not an open file\n");
|
|
return;
|
|
}
|
|
if (!isstr(fmt)) {
|
|
fprintf(stderr, "fmt argument is not a string\n");
|
|
return;
|
|
}
|
|
if (!isnum(value)) {
|
|
fprintf(stderr, "value argument is not a numeric value\n");
|
|
return;
|
|
}
|
|
|
|
/* write value in decimal */
|
|
fprintf(stream, fmt, value);
|
|
if (ferror(stream)) {
|
|
fprintf(stderr, "error in writing to file: %s error(%d): %s\n", filename, errno(stream), strerror(stream));
|
|
return;
|
|
}
|
|
|
|
/* flush to be sure it is completely written */
|
|
fflush(outfile);
|
|
if (ferror(outfile)) {
|
|
fprintf(stderr, "error in flushing to file: %s error(%d): %s\n", filename, errno(stream), strerror(stream));
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* wd2f - write a value to an open file in decimal
|
|
*/
|
|
define wd2f(value) {
|
|
return w2f(outfilename, outfile, "%d\n", value);
|
|
}
|
|
|
|
|
|
/*
|
|
* wx2f - write a value to an open file in hexadecimal
|
|
*/
|
|
define wx2f(value) {
|
|
return w2f(outfilename, outfile, "%x\n", value);
|
|
}
|