Fix some error messages

There's many more to go.

chgrp.c

@@ -53,12 +53,12 @@ main(int argc, char *argv[])
 	if (errno)
 		eprintf("getgrnam %s:");
 	else if (!gr)
-		eprintf("chgrp: '%s': No such group\n", argv[0]);
+		eprintf("getgrnam %s: no such group\n", argv[0]);
 	gid = gr->gr_gid;
 
 	while (*++argv) {
 		if (stat(*argv, &st) == -1) {
-			fprintf(stderr, "chgrp: '%s': %s\n", *argv,
+			fprintf(stderr, "stat %s: %s\n", *argv,
 					strerror(errno));
 			failures++;
 			continue;

comm.c

@@ -44,7 +44,7 @@ main(int argc, char *argv[])
 		if (argv[i][0] == '-')
 			argv[i] = "/dev/fd/0";
 		if (!(fp[i] = fopen(argv[i], "r")))
-			eprintf("comm: '%s':", argv[i]);
+			eprintf("fopen %s:", argv[i]);
 	}
 
 	for (;;) {
@@ -94,9 +94,9 @@ nextline(char *buf, int n, FILE *f, char *name)
 {
 	buf = fgets(buf, n, f);
 	if (!buf && !feof(f))
-		eprintf("comm: '%s':", name);
+		eprintf("%s: read error:", name);
 	if (buf && !strchr(buf, '\n'))
-		eprintf("comm: '%s': line too long.\n", name);
+		eprintf("%s: line too long\n", name);
 	return buf;
 }
 

rmdir.c

@@ -1,8 +1,6 @@
 /* See LICENSE file for copyright and license details. */
-#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <unistd.h>
 
 #include "util.h"
@@ -26,8 +24,6 @@ main(int argc, char *argv[])
 
 	for (; argc > 0; argc--, argv++)
 		if (rmdir(argv[0]) == -1)
-			fprintf(stderr, "rmdir: '%s': %s\n",
-				argv[0], strerror(errno));
-
+			weprintf("rmdir %s:", argv[0]);
 	return 0;
 }

unexpand.c

@@ -66,8 +66,7 @@ in(Fdescr *f)
 	wint_t c = fgetwc(f->fp);
 
 	if (c == WEOF && ferror(f->fp))
-		eprintf("'%s' read error:", f->name);
-
+		eprintf("%s: read error:", f->name);
 	return c;
 }
 
@@ -76,7 +75,7 @@ out(wint_t c)
 {
 	putwchar(c);
 	if (ferror(stdout))
-		eprintf("write error:");
+		eprintf("stdout: write error:");
 }
 
 static void

util/crypt.c

@@ -138,7 +138,7 @@ cryptsum(struct crypt_ops *ops, FILE *fp, const char *f,
 	while ((n = fread(buf, 1, sizeof(buf), fp)) > 0)
 		ops->update(ops->s, buf, n);
 	if (ferror(fp)) {
-		weprintf("read error: %s:", f);
+		weprintf("%s: read error:", f);
 		return 1;
 	}
 	ops->sum(ops->s, md);