1 #include <stdio.h>

2 #include <string.h>

3 #include "opt.h"

4

5 static struct {

6 const char *name;

7 RendererType rtype;

8 } rend[] = {

9 { "fast", REND_FAST },

10 { 0, REND_NONE }

11 };

12

13 Options opt;

14

15 static void init_opt()

16 {

17 opt.fname = 0;

18 opt.rend_type = REND_FAST;

19 }

20

21 static RendererType renderer_type(const char *name)

22 {

23 for(int i=0; rend[i].name; i++) {

24 if(strcmp(rend[i].name, name) == 0) {

25 return rend[i].rtype;

26 }

27 }

28 return REND_NONE;

29 }

30

31 int parse_args(int argc, char **argv)

32 {

33 init_opt();

34

35 for(int i=1; i<argc; i++) {

36 if(argv[i][0] == '-') {

37 if(argv[i][2] == 0) {

38 switch(argv[i][1]) {

39 case 'r':

40 if((opt.rend_type = renderer_type(argv[++i])) == REND_NONE) {

41 if(strcmp(argv[i], "help") == 0) {

42 printf("available renderers: ");

43 for(int j=0; rend[j].name; j++) {

44 printf("%s ", rend[j].name);

45 }

46 putchar('\n');

47 return -1;

48 }

49 fprintf(stderr, "unknown renderer type: %s (use -r help to show list of renderers)\n", argv[i]);

50 return -1;

51 }

52 break;

53

54 default:

55 fprintf(stderr, "invalid option: %s\n", argv[i]);

56 return -1;

57 }

58 } else {

59 fprintf(stderr, "invalid option: %s\n", argv[i]);

60 return -1;

61 }

62 } else {

63 if(opt.fname) {

64 fprintf(stderr, "unexpected argument: %s\n", argv[i]);

65 return -1;

66 }

67 opt.fname = argv[i];

68 }

69 }

70

71 return 0;

72 }