ubase

suckless linux base utils
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commit b8d1f834376392a5ce088e719bb3089b32a75e4b
parent 6e4a0da527d6f063d47e865910692aa80e4bb554
Author: sin <sin@2f30.org>
Date:   Mon Aug 12 11:26:34 +0100

Optimize dmesg(1) output on Linux

Diffstat:
linux/dmesg.c | 8++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/linux/dmesg.c b/linux/dmesg.c @@ -2,6 +2,7 @@ #include <sys/klog.h> #include <unistd.h> #include <stdio.h> +#include <string.h> enum { SYSLOG_ACTION_READ_ALL = 3, @@ -24,20 +25,23 @@ int dmesg_show(int fd, const void *buf, size_t n) { int last = '\n'; + char newbuf[n], *q = newbuf; const char *p = buf; size_t i; + memset(newbuf, 0, n); for (i = 0; i < n; ) { if (last == '\n' && p[i] == '<') { i += 2; if (i + 1 < n && p[i + 1] == '>') i++; } else { - if (write(fd, &p[i], 1) != 1) - return -1; + *q++ = p[i]; } last = p[i++]; } + if (write(fd, newbuf, n) != n) + return -1; if (last != '\n') if (write(fd, "\n", 1) != 1) return -1;