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/*
* sponge.c - read in all available info from stdin, then output it to
* file named on the command line
*
* Copyright © 2006 Tollef Fog Heen
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
void usage() {
printf("sponge <file>: suck in all input from stdin and write it to <file>\n");
exit(0);
}
int main(int argc, char **argv) {
char *buf, *bufstart;
size_t bufsize = 8192;
size_t bufused = 0;
ssize_t i = 0;
int outfd;
if (argc > 2 || (argc == 2 && strcmp(argv[1], "-h") == 0)) {
usage();
}
bufstart = buf = malloc(bufsize);
if (!buf) {
perror("malloc");
exit(1);
}
while ((i = read(0, buf, bufsize - bufused)) > 0) {
bufused = bufused+i;
if (bufused == bufsize) {
bufsize *= 2;
bufstart = realloc(bufstart, bufsize);
if (!bufstart) {
perror("realloc");
exit(1);
}
}
buf = bufstart + bufused;
}
if (i == -1) {
perror("read");
exit(1);
}
if (argc == 2) {
outfd = open(argv[1], O_CREAT | O_TRUNC | O_WRONLY, 0666);
if (outfd == -1) {
fprintf(stderr, "Can't open %s: %s\n", argv[1], strerror(errno));
exit(1);
}
}
else {
outfd = 1;
}
i = write(outfd, bufstart, bufused);
if (i == -1) {
perror("write");
exit(1);
}
i = close(outfd);
if (i == -1) {
perror("close");
exit(1);
}
return 0;
}
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