From d16fdbb6fa223efdf1ba8cd76999aafe21b3cfb3 Mon Sep 17 00:00:00 2001
From: Matthias-Christian Ott <ott@enolink.de>
Date: Fri, 4 Jul 2008 18:05:08 +0200
Subject: [PATCH] replace eprint() functions with BSD error functions

---
 pty.c  | 12 ++++++------
 st.c   | 14 +++++++++-----
 std.c  | 25 +++++++++++++++----------
 util.c | 23 +----------------------
 util.h |  2 --
 5 files changed, 31 insertions(+), 45 deletions(-)

diff --git a/pty.c b/pty.c
index 4c38d86..a173dab 100644
--- a/pty.c
+++ b/pty.c
@@ -22,22 +22,22 @@ getpty(void) {
 	ptm = open("/dev/ptmx", O_RDWR);
 	if(ptm == -1)
 		if(openpty(&ptm, &pts, NULL, NULL, NULL) == -1)
-			eprintn("error, cannot open pty");
+			err(EXIT_FAILURE, "cannot open pty");
 #endif
 #if defined(_XOPEN_SOURCE)
 	if(ptm != -1) {
 		if(grantpt(ptm) == -1)
-			eprintn("error, cannot grant access to pty");
+			err(EXIT_FAILURE, "cannot grant access to pty");
 		if(unlockpt(ptm) == -1)
-			eprintn("error, cannot unlock pty");
+			err(EXIT_FAILURE, "cannot unlock pty");
 		ptsdev = ptsname(ptm);
 		if(!ptsdev)
-			eprintn("error, slave pty name undefined");
+			err(EXIT_FAILURE, "slave pty name undefined");
 		pts = open(ptsdev, O_RDWR);
 		if(pts == -1)
-			eprintn("error, cannot open slave pty");
+			err(EXIT_FAILURE, "cannot open slave pty");
 	}
 	else
-		eprintn("error, cannot open pty");
+		err(EXIT_FAILURE, "cannot open pty");
 #endif
 }
diff --git a/st.c b/st.c
index e82faaa..8a8804f 100644
--- a/st.c
+++ b/st.c
@@ -1,13 +1,17 @@
 /* See LICENSE file for copyright and license details. */
-#include "util.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 int
 main(int argc, char *argv[]) {
-	if(argc == 2 && !strcmp("-v", argv[1]))
-		eprint("st-"VERSION", © 2007-2008 st engineers, see LICENSE for details\n");
-	else if(argc != 1)
-		eprint("usage: st [-v]\n");
+	if(argc == 2 && !strcmp("-v", argv[1])) {
+		fprintf(stderr, "st-"VERSION", © 2007-2008 st engineers, see LICENSE for details\n");
+		exit(EXIT_SUCCESS);
+	}
+	else if(argc != 1) {
+		fprintf(stderr, "usage: st [-v]\n");
+		exit(EXIT_FAILURE);
+	}
 	return 0;
 }
diff --git a/std.c b/std.c
index 84048e4..daf759e 100644
--- a/std.c
+++ b/std.c
@@ -3,6 +3,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <ctype.h>
+#include <err.h>
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -73,7 +74,7 @@ getch() {
 	if(rbuf.i++ >= rbuf.n) {
 		rbuf.n = read(ptm, rbuf.data, LENGTH(rbuf.data));
 		if(rbuf.n == -1)
-			eprintn("error, cannot read from slave pty");
+			err(EXIT_FAILURE, "cannot read from slave pty");
 		rbuf.i = 0;
 	}
 	return rbuf.data[rbuf.i];
@@ -113,7 +114,7 @@ parseesc(void) {
 				qmark = 1;
 			else if(c == ';') {
 				if(!digit)
-					eprint("syntax error\n");
+					errx(EXIT_FAILURE, "syntax error");
 				digit = 0;
 				j++;
 			}
@@ -216,7 +217,7 @@ shell(void) {
 	pid = fork();
 	switch(pid) {
 	case -1:
-		eprint("error, cannot fork\n");
+		err(EXIT_FAILURE, "cannot fork");
 	case 0:
 		setsid();
 		dup2(pts, STDIN_FILENO);
@@ -237,7 +238,7 @@ sigchld(int n) {
 	int ret;
 
 	if(waitpid(pid, &ret, 0) == -1)
-		eprintn("error, waiting for child failed");
+		err(EXIT_FAILURE, "waiting for child failed");
 	if(WIFEXITED(ret))
 		exit(WEXITSTATUS(ret));
 	else
@@ -257,7 +258,7 @@ unbuffer(void) {
 void
 ungetch(int c) {
 	if(rbuf.i + 1 >= rbuf.n)
-		eprint("error, read buffer full\n");
+		errx(EXIT_FAILURE, "read buffer full");
 	rbuf.data[rbuf.i++] = c;
 }
 
@@ -266,10 +267,14 @@ main(int argc, char *argv[]) {
 	fd_set rfds;
 	int r;
 
-	if(argc == 2 && !strcmp("-v", argv[1]))
-		eprint("std-"VERSION", © 2008 Matthias-Christian Ott\n");
-	else if(argc == 1)
-		eprint("usage: st [-v]\n");
+	if(argc == 2 && !strcmp("-v", argv[1])) {
+		fprintf(stderr, "std-"VERSION", © 2008 Matthias-Christian Ott\n");
+		exit(EXIT_SUCCESS);
+	}
+	else if(argc == 1) {
+		fprintf(stderr, "usage: st [-v]\n");
+		exit(EXIT_FAILURE);
+	}
 	getpty();
 	shell();
 	FD_ZERO(&rfds);
@@ -278,7 +283,7 @@ main(int argc, char *argv[]) {
 	for(;;) {
 		r = select(ptm + 1, &rfds, NULL, NULL, NULL);
 		if(r == -1)
-			eprintn("error, cannot select");
+			err(EXIT_FAILURE, "cannot select");
 		if(FD_ISSET(ptm, &rfds)) {
 			do {
 				c = getch();
diff --git a/util.c b/util.c
index f8b9eee..2e33fbd 100644
--- a/util.c
+++ b/util.c
@@ -11,27 +11,6 @@ emallocz(unsigned int size) {
 	void *res = calloc(1, size);
 
 	if(!res)
-		eprint("fatal: could not malloc() %u bytes\n", size);
+		err(EXIT_FAILURE, "could not malloc() %u bytes\n", size);
 	return res;
 }
-
-void
-eprint(const char *errstr, ...) {
-	va_list ap;
-
-	va_start(ap, errstr);
-	vfprintf(stderr, errstr, ap);
-	va_end(ap);
-	exit(EXIT_FAILURE);
-}
-
-void
-eprintn(const char *errstr, ...) {
-	va_list ap;
-
-	va_start(ap, errstr);
-	vfprintf(stderr, errstr, ap);
-	va_end(ap);
-	fprintf(stderr, ": %s\n", strerror(errno));
-	exit(EXIT_FAILURE);
-}
diff --git a/util.h b/util.h
index 34db193..9d87a95 100644
--- a/util.h
+++ b/util.h
@@ -1,5 +1,3 @@
 /* See LICENSE file for copyright and license details. */
 
 void *emallocz(unsigned int size);
-void eprint(const char *errstr, ...);
-void eprintn(const char *errstr, ...);