3276fbea1c
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.
24 lines
398 B
C
24 lines
398 B
C
/* See LICENSE file for copyright and license details. */
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#include <unistd.h>
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#include "../util.h"
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int
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concat(int f1, const char *s1, int f2, const char *s2)
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{
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char buf[BUFSIZ];
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ssize_t n;
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while ((n = read(f1, buf, sizeof(buf))) > 0) {
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if (writeall(f2, buf, n) < 0) {
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weprintf("write %s:", s2);
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return -2;
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}
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}
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if (n < 0) {
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weprintf("read %s:", s1);
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return -1;
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}
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return 0;
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}
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