#include<stdio.h>

void strip_comments (FILE* input, FILE* output) {

enum enum_mode {normal, slash, q1, q1b, q2, q2b, single, multi, star};

int ichar;

enum_mode mode;

mode = normal;

while ((ichar=fgetc(input))!=EOF) {

switch (mode) {

case normal:

switch (ichar) {

case '/':

mode=slash;

break;

case '\'':

fputc (ichar, output);

mode=q1;

break;

case '"':

fputc (ichar, output);

mode=q2;

break;

default:

fputc (ichar, output);

}

break;

case slash:

switch (ichar) {

case '/':

mode=single;

break;

case '*':

mode=multi;

break;

default:

fputc ('/', output);

fputc (ichar, output);

mode=normal;

}

break;

case q1:

switch (ichar) {

case '\\':

fputc ('\\', output);

mode=q1b;

break;

case '\'':

fputc (ichar, output);

mode=normal;

break;

default:

fputc (ichar, output);

}

break;

case q1b:

fputc (ichar, output);

mode=q1;

break;

case q2:

switch (ichar) {

case '\\':

fputc (ichar, output);

mode=q2b;

break;

case '"':

fputc (ichar, output);

mode=normal;

break;

default:

fputc (ichar, output);

}

break;

case q2b:

fputc (ichar, output);

mode=q2;

break;

case single:

switch (ichar) {

case '\r':

case '\n':

fputc (ichar, output);

mode=normal;

break;

}

break;

case multi:

switch (ichar) {

case '*':

mode=star;

break;

}

break;

case star:

switch (ichar) {

case '/':

mode=normal;

break;

default:

mode=multi;

}

break;

}

}

}

int main (int argc, char* argv[]) {

if (argc!=3) {

char* prog;

prog=argv[0];

while (*prog!=0) ++prog;

while (*prog!='.') { *prog=0; --prog; }

*prog=0;

while (*prog!='\\') --prog;

++prog;

fprintf(stderr, "Comment stripper for C/C++ source files\n");

fprintf(stderr, "Copyright © 2016, PCForrest\n\n");

fprintf(stderr, "Usage:\n\n%s src dst\n\n", prog);

fprintf(stderr, " src - source file\n");

fprintf(stderr, " dst - destination file\n\n");

return -1;

}

FILE* source;

FILE* destination;

source=fopen(argv[1], "r");

destination=fopen(argv[2], "w");

if (!source !destination) {

if (source)

fclose (source);

if (destination)

fclose (destination);

return -1;

}

strip_comments (source, destination);

fclose (source);

fclose (destination);

return 0;

}

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