Split errc family of functions from err ones

On most systems the err family of functions is already present, but are
missing the errc family of functions, which are also present on some
other systems. Splitting them into separate files will make it easer to
conditionally include one or the other.

configure.ac

@@ -257,6 +257,8 @@ AC_CHECK_FUNCS([\
 
 need_arc4random=yes
 need_bsd_getopt=yes
+need_err=yes
+need_errc=yes
 need_progname=yes
 need_md5=yes
 need_nlist=yes
@@ -271,6 +273,7 @@ AS_CASE([$host_os],
     # On glibc >= 2.38, strlcpy() and strlcat() got added,
     # so these could then be dropped on the next SOVERSION bump.
     #need_strl=no
+    need_err=no
   ],
   [*-musl*], [
     # On musl >= 0.5.0, strlcpy() and strlcat() were already implemented,
@@ -279,6 +282,7 @@ AS_CASE([$host_os],
     # On musl >= 0.9.7, optreset got implemented, so bsd_getopt() can then
     # be dropped on the next SOVERSION bump.
     #need_bsd_getopt=no
+    need_err=no
     # On musl >= 1.1.19, fopencookie() got implemented, and because we were
     # checking for its presence to decide whether to build funopen(), it got
     # included in builds even when previously it had not been included, which
@@ -292,6 +296,8 @@ AS_CASE([$host_os],
     # there, so we can avoid providing these with no ABI breakage.
     need_arc4random=no
     need_bsd_getopt=no
+    need_err=no
+    need_errc=no
     need_progname=no
     need_transparent_libmd=no
     need_md5=no
@@ -310,6 +316,8 @@ AM_CONDITIONAL([HAVE_GETENTROPY], [test "x$ac_cv_func_getentropy" = "xyes"])
 
 AM_CONDITIONAL([NEED_ARC4RANDOM], [test "x$need_arc4random" = "xyes"])
 AM_CONDITIONAL([NEED_BSD_GETOPT], [test "x$need_bsd_getopt" = "xyes"])
+AM_CONDITIONAL([NEED_ERR], [test "x$need_err" = "xyes"])
+AM_CONDITIONAL([NEED_ERRC], [test "x$need_errc" = "xyes"])
 AM_CONDITIONAL([NEED_PROGNAME], [test "x$need_progname" = "xyes"])
 AM_CONDITIONAL([NEED_TRANSPARENT_LIBMD], [test "x$need_transparent_libmd" = "xyes"])
 AM_CONDITIONAL([NEED_MD5], [test "x$need_md5" = "xyes"])

man/Makefile.am

@@ -168,7 +168,6 @@ dist_man_MANS = \
 	byteorder.3bsd \
 	closefrom.3bsd \
 	dehumanize_number.3bsd \
-	errc.3bsd \
 	expand_number.3bsd \
 	explicit_bzero.3bsd \
 	fgetln.3bsd \
@@ -238,6 +237,12 @@ dist_man_MANS = \
 	vis.3bsd \
 	# EOL
 
+if NEED_ERRC
+dist_man_MANS += \
+	errc.3bsd \
+	# EOL
+endif
+
 if NEED_PROGNAME
 dist_man_MANS += \
 	getprogname.3bsd \

src/Makefile.am

@@ -78,7 +78,6 @@ endif
 libbsd_la_SOURCES = \
 	closefrom.c \
 	dehumanize_number.c \
-	err.c \
 	expand_number.c \
 	explicit_bzero.c \
 	fgetln.c \
@@ -114,6 +113,18 @@ libbsd_la_SOURCES = \
 	vis.c \
 	# EOL
 
+if NEED_ERR
+libbsd_la_SOURCES += \
+	err.c \
+	# EOL
+endif
+
+if NEED_ERRC
+libbsd_la_SOURCES += \
+	errc.c \
+	# EOL
+endif
+
 if NEED_PROGNAME
 libbsd_la_SOURCES += \
 	progname.c \

src/err.c

@@ -1,6 +1,5 @@
 /*
- * Copyright © 2006 Robert Millan
- * Copyright © 2011, 2019 Guillem Jover <guillem@hadrons.org>
+ * Copyright © 2019 Guillem Jover <guillem@hadrons.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,58 +25,12 @@
  */
 
 #include <err.h>
-#ifdef LIBBSD_NEED_ERR_H_FUNCS
 #include <errno.h>
-#endif
 #include <string.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
 
-void
-vwarnc(int code, const char *format, va_list ap)
-{
-	fprintf(stderr, "%s: ", getprogname());
-	if (format) {
-		vfprintf(stderr, format, ap);
-		fprintf(stderr, ": ");
-	}
-	fprintf(stderr, "%s\n", strerror(code));
-}
-
-void
-warnc(int code, const char *format, ...)
-{
-	va_list ap;
-
-	va_start(ap, format);
-	vwarnc(code, format, ap);
-	va_end(ap);
-}
-
-void
-verrc(int status, int code, const char *format, va_list ap)
-{
-	fprintf(stderr, "%s: ", getprogname());
-	if (format) {
-		vfprintf(stderr, format, ap);
-		fprintf(stderr, ": ");
-	}
-	fprintf(stderr, "%s\n", strerror(code));
-	exit(status);
-}
-
-void
-errc(int status, int code, const char *format, ...)
-{
-	va_list ap;
-
-	va_start(ap, format);
-	verrc(status, code, format, ap);
-	va_end(ap);
-}
-
-#ifdef LIBBSD_NEED_ERR_H_FUNCS
 void
 vwarn(const char *format, va_list ap)
 {
@@ -148,4 +101,3 @@ errx(int eval, const char *format, ...)
 	verrx(eval, format, ap);
 	va_end(ap);
 }
-#endif

src/errc.c

@@ -0,0 +1,75 @@
+/*
+ * Copyright © 2006 Robert Millan
+ * Copyright © 2011, 2019 Guillem Jover <guillem@hadrons.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <err.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+void
+vwarnc(int code, const char *format, va_list ap)
+{
+	fprintf(stderr, "%s: ", getprogname());
+	if (format) {
+		vfprintf(stderr, format, ap);
+		fprintf(stderr, ": ");
+	}
+	fprintf(stderr, "%s\n", strerror(code));
+}
+
+void
+warnc(int code, const char *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	vwarnc(code, format, ap);
+	va_end(ap);
+}
+
+void
+verrc(int status, int code, const char *format, va_list ap)
+{
+	fprintf(stderr, "%s: ", getprogname());
+	if (format) {
+		vfprintf(stderr, format, ap);
+		fprintf(stderr, ": ");
+	}
+	fprintf(stderr, "%s\n", strerror(code));
+	exit(status);
+}
+
+void
+errc(int status, int code, const char *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	verrc(status, code, format, ap);
+	va_end(ap);
+}