GNUmakefile, intcmp(1), npc(1), scrut(1), str(1), strcmp(1), include/sysexits.h: added fallback header file for when systems don’t have sysexits.h(3)

GNUmakefile

@@ -17,22 +17,23 @@
 PREFIX=/usr/local
 
 CC=cc
-CFLAGS=-O3 -Lbuild/lib
+CFLAGS=-O3 -Lbuild/lib -idirafter include
 
 RUSTC=rustc
-RUSTCFLAGS=-C opt-level=z -C codegen-units=1 -C panic=abort -C lto=y -C strip=symbols
+RUSTCFLAGS=-C opt-level=z -C codegen-units=1 -C panic=abort -C lto=y \
+	-C strip=symbols
 
 ifeq ($(CC), gcc)
-	CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto \
-		-Lbuild/lib
+	CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto -Lbuild/lib \
+		-idirafter include
 endif
 
 ifeq ($(CC), clang)
-	CFLAGS=-O3 -Wall -Lbuild/lib
+	CFLAGS=-O3 -Wall -Lbuild/lib -idirafter include
 endif
 
 ifeq ($(CC), tcc)
-	CFLAGS=-O3 -s -Wl -flto -Lbuild/lib
+	CFLAGS=-O3 -s -Wl -flto -Lbuild/lib -idirafter include
 endif
 
 build: build_dir false intcmp scrut str strcmp true

include/sysexits.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023 DTB <trinity@trinity.moe>
+ * Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
+ * SPDX-License-Identifier: CC0
+ *
+ * This work is marked with CC0 1.0. To view a copy of this license, visit
+ * <http://creativecommons.org/publicdomain/zero/1.0>.
+ */
+
+#ifndef _SYSEXITS_H
+#define _SYSEXITS_H 2
+
+#ifndef EXIT_FAILURE
+#include <stdlib.h>
+#endif
+
+#define EX_OK EXIT_SUCCESS
+
+#define EX__BASE EXIT_FAILURE /* base value for error messages */
+#define EX_USAGE EXIT_FAILURE /* command line usage error */
+#define EX_DATAERR EXIT_FAILURE /* data format error */
+#define EX_NOINPUT EXIT_FAILURE /* cannot open input */
+#define EX_NOUSER EXIT_FAILURE /* addressee unknown */
+#define EX_NOHOST EXIT_FAILURE /* host name unknown */
+#define EX_UNAVAILABLE EXIT_FAILURE /* service unavailable */
+#define EX_SOFTWARE EXIT_FAILURE /* internal software error */
+#define EX_OSERR EXIT_FAILURE /* system error (e.g., can't fork) */
+#define EX_OSFILE EXIT_FAILURE /* critical OS file missing */
+#define EX_CANTCREAT EXIT_FAILURE /* can't create (user) output file */
+#define EX_IOERR EXIT_FAILURE /* input/output error */
+#define EX_TEMPFAIL EXIT_FAILURE /* temp failure; user is invited to retry */
+#define EX_PROTOCOL EXIT_FAILURE /* remote error in protocol */
+#define EX_NOPERM EXIT_FAILURE /* permission denied */
+#define EX_CONFIG EXIT_FAILURE /* configuration error */
+
+#define EX__MAX EXIT_FAILURE /* maximum listed value */
+
+#endif

src/intcmp.c

@@ -19,10 +19,8 @@
 #include <errno.h> /* errno */
 #include <stdio.h> /* fprintf(3), stderr */
 #include <stdlib.h> /* strtol(3), size_t, EXIT_FAILURE */
-#ifndef EX_USAGE
-#	define EX_USAGE EXIT_FAILURE
-#endif
 #include <unistd.h> /* getopt(3), optind */
+#include <sysexits.h>
 
 /* 0b00? */		/*                     Equal | -e  | 0b001 | 1 */
 #define EQUAL	0x01	/*                   Greater | -g  | 0b010 | 2 */

src/npc.c

@@ -20,12 +20,7 @@
                     * EOF */
 #include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
 #include <unistd.h> /* getopt(3) */
-#if !defined EX_USAGE
-#	define EX_USAGE EXIT_FAILURE
-#endif
-#if !defined EX_OK
-#	define EX_OK EXIT_SUCCESS
-#endif
+#include <sysexits.h>
 
 int main(int argc, char *argv[]){
 	int c;

src/scrut.c

@@ -19,13 +19,11 @@
 #include <stdio.h> /* fprintf(3), stderr, NULL */
 #include <stdlib.h> /* EXIT_FAILURE */
 #include <string.h> /* strchr(3) */
-#ifndef EX_USAGE
-#	define EX_USAGE EXIT_FAILURE
-#endif
 #include <unistd.h> /* access(3), getopt(3), F_OK, R_OK, W_OK, X_OK */
 #include <sys/stat.h> /* lstat(3), stat struct, S_ISBLK, S_ISCHR, S_ISDIR,
                        * S_ISFIFO, S_ISGID, S_ISREG, S_ISLNK, S_ISSOCK,
                        * S_ISUID, S_ISVTX */
+#include <sysexits.h>
 
 static char args[] = "bcdefghkprsuwxLS";
 static char ops[(sizeof args) / (sizeof *args)];

src/str.c

@@ -22,9 +22,7 @@
 #include <stdio.h> /* fprintf(3) */
 #include <stdlib.h> /* EXIT_FAILURE */
 #include <string.h> /* strcmp(3) */
-#if !defined EX_USAGE
-#	define EX_USAGE EXIT_FAILURE
-#endif
+#include <sysexits.h>
 
 static char *program_name = "str";
 

src/strcmp.c

@@ -1,8 +1,6 @@
 #include <stdio.h> /* fprintf(3), stderr */
 #include <stdlib.h> /* EXIT_FAILURE */
-#if !defined EX_USAGE
-#	define EX_USAGE EXIT_FAILURE
-#endif
+#include <sysexits.h>
 
 static char *program_name = "strcmp";