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 opt.xsz = 800;

20 opt.ysz = 800;

21 }

22

23 static RendererType renderer_type(const char *name)

24 {

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

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

27 return rend[i].rtype;

28 }

29 }

30 return REND_NONE;

31 }

32

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

34 {

35 init_opt();

36

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

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

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

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

41 case 's':

42 if(sscanf(argv[++i], "%dx%d", &opt.xsz, &opt.ysz) != 2) {

43 fprintf(stderr, "-s must be followed by the window size (WxH)\n");

44 return -1;

45 }

46 break;

47

48 case 'r':

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

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

51 printf("available renderers: ");

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

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

54 }

55 putchar('\n');

56 return -1;

57 }

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

59 return -1;

60 }

61 break;

62

63 default:

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

65 return -1;

66 }

67 } else {

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

69 return -1;

70 }

71 } else {

72 if(opt.fname) {

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

74 return -1;

75 }

76 opt.fname = argv[i];

77 }

78 }

79

80 return 0;

81 }