使用getopt函数对命令行短形参进行处理

 1 #include <err.h>
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <unistd.h>
 5 
 6 static void usage(char *);
 7 
 8 int
 9 main(int argc, char **argv)
10 {
11     int ch;
12     int usageflag = 0;
13     char *source = NULL;
14     char *match = NULL;
15     char *progname = argv[0];
16     
17     while ((ch = getopt(argc, argv, "hs:m:")) != -1)
18         switch (ch) {
19         case ‘s‘:
20             source = optarg;
21             break;
22         case ‘m‘:
23             match = optarg;
24             break;
25         case ‘h‘:
26             usageflag = 1;
27             break;
28         default:
29             warn("undefined arg %c\n", ch);
30             break;
31         }
32     
33     if (usageflag != 1 && source != NULL && match != NULL)
34         printf("%s\n", strstr(source, match));
35     else
36         usage(progname);
37     
38     return 0;
39 }
40 
41 static void
42 usage(char *progname)
43 {
44     warnx("Usage: %s [-h] -s source -m match", progname);
45 }

 1 src.c=getopttest.c
 2 cflags=-O3
 3 target.exe=getopttest
 4 cc=gcc
 5 
 6 all: $(target.exe)
 7 
 8 $(target.exe):
 9     $(cc) $(src.c) -o $(target.exe) $(cflags)
10 
11 .PHONY: dist clean
12 
13 ######################################################
14 
15 source.d=.
16 target.tar=getopt.tar
17 
18 dist: $(target.tar)
19 
20 $(target.tar): clean
21     -rm *~
22     tar cf $(target.tar) $(source.d)
23 
24 ######################################################
25 
26 clean:
27     -rm $(target.exe) $(target.tar)