makeopt.awk

unix环境高级编程第二版配套源代码 unix环境高级编程第二版配套源代码

BEGIN	{
	printf("#include \"apue.h\"\n")
	printf("#include <errno.h>\n")
	printf("\n")
	printf("static void	pr_sysconf(char *, int);\n")
	printf("static void	pr_pathconf(char *, char *, int);\n")
	printf("\n")
	printf("int\n")
	printf("main(int argc, char *argv[])\n")
	printf("{\n")
	printf("\tif (argc != 2)\n")
	printf("\t\terr_quit(\"usage: a.out <dirname>\");\n\n")
	FS="\t+"
	while (getline <"sysopt.sym" > 0) {
		printf("#ifdef %s\n", $1)
		printf("\tprintf(\"%s is defined (val is %%d)\\n\", %s+0);\n", $1, $1)
		printf("#else\n")
		printf("\tprintf(\"%s is undefined\\n\");\n", $1)
		printf("#endif\n")
		printf("#ifdef %s\n", $2)
		printf("\tpr_sysconf(\"sysconf says %s =\", %s);\n", $1, $2)
		printf("#else\n")
		printf("\tprintf(\"no symbol for %s\\n\");\n", $1)
		printf("#endif\n")
		printf("\tprintf(\"\\n\");\n")
	}
	close("sysopt.sym")
	while (getline <"pathopt.sym" > 0) {
		printf("#ifdef %s\n", $1)
		printf("\tprintf(\"%s is defined (val is %%d)\\n\", %s+0);\n", $1, $1)
		printf("#else\n")
		printf("\tprintf(\"%s is undefined\\n\");\n", $1)
		printf("#endif\n")
		printf("#ifdef %s\n", $2)
		printf("\tpr_pathconf(\"pathconf says %s =\", argv[1], %s);\n", $1, $2)
		printf("#else\n")
		printf("\tprintf(\"no symbol for %s\\n\");\n", $1)
		printf("#endif\n")
		printf("\tprintf(\"\\n\");\n")
	}
	close("pathopt.sym")
	exit
}
END	{
	printf("\texit(0);\n")
	printf("}\n\n")
	printf("static void\n")
	printf("pr_sysconf(char *mesg, int name)\n")
	printf("{\n")
	printf("\tlong	val;\n\n")
	printf("\tfputs(mesg, stdout);\n")
	printf("\terrno = 0;\n")
	printf("\tif ((val = sysconf(name)) < 0) {\n")
	printf("\t\tif (errno != 0) {\n")
	printf("\t\t\tif (errno == EINVAL)\n")
	printf("\t\t\t\tfputs(\" (not supported)\\n\", stdout);\n")
	printf("\t\t\telse\n")
	printf("\t\t\t\terr_sys(\"sysconf error\");\n")
	printf("\t\t} else {\n")
	printf("\t\t\tfputs(\" (no limit)\\n\", stdout);\n")
	printf("\t\t}\n")
	printf("\t} else {\n")
	printf("\t\tprintf(\" %%ld\\n\", val);\n")
	printf("\t}\n")
	printf("}\n\n")
	printf("static void\n")
	printf("pr_pathconf(char *mesg, char *path, int name)\n")
	printf("{\n")
	printf("\tlong	val;\n")
	printf("\n")
	printf("\tfputs(mesg, stdout);\n")
	printf("\terrno = 0;\n")
	printf("\tif ((val = pathconf(path, name)) < 0) {\n")
	printf("\t\tif (errno != 0) {\n")
	printf("\t\t\tif (errno == EINVAL)\n")
	printf("\t\t\t\tfputs(\" (not supported)\\n\", stdout);\n")
	printf("\t\t\telse\n")
	printf("\t\t\t\terr_sys(\"pathconf error, path = %%s\", path);\n")
	printf("\t\t} else {\n")
	printf("\t\t\tfputs(\" (no limit)\\n\", stdout);\n")
	printf("\t\t}\n")
	printf("\t} else {\n")
	printf("\t\tprintf(\" %%ld\\n\", val);\n")
	printf("\t}\n")
	printf("}\n")
}