sbase/libutil/concat.c

/* See LICENSE file for copyright and license details. */
#include <unistd.h>

#include "../util.h"

int
concat(int f1, const char *s1, int f2, const char *s2)
{
	char buf[BUFSIZ];
	ssize_t n;

	while ((n = read(f1, buf, sizeof(buf))) > 0) {
		if (writeall(f2, buf, n) < 0) {
			weprintf("write %s:", s2);
			return -2;
		}
	}
	if (n < 0) {
		weprintf("read %s:", s1);
		return -1;
	}
	return 0;
}
add tail 2011-05-26 17:18:42 +00:00			`/* See LICENSE file for copyright and license details. */`
concat: Use plain read/write instead of buffered stdio If we are just copying data from one file to another, we don't need to fill a complete buffer, just read a chunk at a time, and write it to the output. 2017-07-03 21:58:49 +00:00			`#include <unistd.h>`
Style inquistion for util and some tools. 2013-03-05 20:46:48 +00:00
add tail 2011-05-26 17:18:42 +00:00			`#include "../util.h"`

concat: Use plain read/write instead of buffered stdio If we are just copying data from one file to another, we don't need to fill a complete buffer, just read a chunk at a time, and write it to the output. 2017-07-03 21:58:49 +00:00			`int`
			`concat(int f1, const char s1, int f2, const char s2)`
add tail 2011-05-26 17:18:42 +00:00			`{`
			`char buf[BUFSIZ];`
concat: Use plain read/write instead of buffered stdio If we are just copying data from one file to another, we don't need to fill a complete buffer, just read a chunk at a time, and write it to the output. 2017-07-03 21:58:49 +00:00			`ssize_t n;`
add tail 2011-05-26 17:18:42 +00:00
concat: Use plain read/write instead of buffered stdio If we are just copying data from one file to another, we don't need to fill a complete buffer, just read a chunk at a time, and write it to the output. 2017-07-03 21:58:49 +00:00			`while ((n = read(f1, buf, sizeof(buf))) > 0) {`
			`if (writeall(f2, buf, n) < 0) {`
			`weprintf("write %s:", s2);`
			`return -2;`
			`}`
			`}`
			`if (n < 0) {`
			`weprintf("read %s:", s1);`
			`return -1;`
Style inquistion for util and some tools. 2013-03-05 20:46:48 +00:00			`}`
concat: Use plain read/write instead of buffered stdio If we are just copying data from one file to another, we don't need to fill a complete buffer, just read a chunk at a time, and write it to the output. 2017-07-03 21:58:49 +00:00			`return 0;`
add tail 2011-05-26 17:18:42 +00:00			`}`