Shell / sed Program To Remove All C and C++ Comments From Program File

Write the shell / sed program which remove all the comments from a simple C program stored in your current directory. You can assume that the c source code contains only syntactically correct comments:
+ start with // and end with a newline

+ starting with /* and ending */ (can be multiline)

+ nesting of comments is not allowed

Make sure that C source is not changed at all.

How do I use this sed script?

$ ./script.sed < input.c
$ ./script.sed < input.c > output.c
$ for c in *.c; do script.sed < $c > /tmp/zyzcc.c; /bin/cp -f /tmp/zyzcc.c $c; done

Sample sed code to remove all comments from sed

1. #! /bin/sed -nf
2.  
3. # Remove C and C++ comments, by Brian Hiles (brian_hiles@rocketmail.com)
4.  
5. # Sped up (and bugfixed to some extent) by Paolo Bonzini (bonzini@gnu.org)
6. # Works its way through the line, copying to hold space the text up to the
7. # first special character (/, ", '). The original version went exactly a
8. # character at a time, hence the greater speed of this one. But the concept
9. # and especially the trick of building the line in hold space are entirely
10. # merit of Brian.
11.  
12. :loop
13.  
14. # This line is sufficient to remove C++ comments!
15. /^/// s,.*,,
16.  
17. /^$/{
18. x
19. p
20. n
21. b loop
22. }
23. /^"/{
24. :double
25. /^$/{
26. x
27. p
28. n
29. /^"/b break
30. b double
31. }
32.  
33. H
34. x
35. s,n(.[^"]*).*,1,
36. x
37. s,.[^"]*,,
38.  
39. /^"/b break
40. /^/{
41. H
42. x
43. s,n(.).*,1,
44. x
45. s/.//
46. }
47. b double
48. }
49.  
50. /^'/{
51. :single
52. /^$/{
53. x
54. p
55. n
56. /^'/b break
57. b single
58. }
59. H
60. x
61. s,n(.[^']*).*,1,
62. x
63. s,.[^']*,,
64.  
65. /^'/b break
66. /^/{
67. H
68. x
69. s,n(.).*,1,
70. x
71. s/.//
72. }
73. b single
74. }
75.  
76. /^/*/{
77. s/.//
78. :ccom
79. s,^.[^*]*,,
80. /^$/ n
81. /^*//{
82. s/..//
83. b loop
84. }
85. b ccom
86. }
87.  
88. :break
89. H
90. x
91. s,n(.[^"'/]*).*,1,
92. x
93. s/.[^"'/]*//
94. b loop
95.