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)

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";