ComCpp2C converter example

[TimoVJL]

ComCpp2C converter converts -> and some keywords from cpp-file for COM to C.

-> to ->lpVtbl->
nullptr to NULL
__uuidof() to &IID_
reinterpret_cast<void**> to (void**)

A bit less modifications by hand

Hopefully someone share us a better program for same purboses.

EDIT 2018-05-23 minor fix ->

Code: [Select]

#define BUFSIZE 4096
char zero;
char buf1[BUFSIZE]; // read buffer
char buf2[BUFSIZE]; // write buffer

// -> nullptr __uuidof() reinterpret_cast<void**>
// const_cast<UINT> static_cast<DWORD>
char *pnptr, *puuid, *pcast, *plptr; // globals

char *check_line(char *buf1)
{ // start values
pnptr = strstr(buf1, "nullptr");
puuid = strstr(buf1, "__uuidof(");
pcast = strstr(buf1, "_cast<");
plptr = strstr(buf1, "->");

if (!(pnptr || puuid || pcast || plptr)) {
return buf1;
}
char *p1 = buf1;
char *p2 = buf2;
char *p3 = buf1 + BUFSIZE;
char *p4;

while (1) {
int len;
if (pnptr && pnptr < p3) p3 = pnptr;
if (puuid && puuid < p3) p3 = puuid;
if (pcast && pcast < p3) p3 = pcast;
if (plptr && plptr < p3) p3 = plptr;

len = p3 - p1;
if (len>0)
memcpy(p2, p1, len);
else strcpy(p2, p1); // copy rest of line
p1 += len;
p2 += len;
if (p3 == pnptr) { // nullptr
p1 += 7; // source buffer pos
strcpy(p2, "NULL");
p2 += 4; // target buffer pos
pnptr = strstr(p3 + 7, "nullptr");
p3 = buf1 + BUFSIZE; // force check
continue;
}
if (p3 == puuid) { // __uuidof(
p1 += 9; // source buffer pos
while (*p1 == ' ') p1++; // delims off
strcpy(p2, "&IID_");
p2 += 5; // target buffer pos
p4 = p1;
while (*p4 && *p4 != ')') p4++;
len = p4 - p1;
strncpy(p2, p1, len);
p1 += len + 1; // past ')'
p2 += len;
puuid = strstr(p3 + 9, "__uuidof(");
p3 = buf1 + BUFSIZE; // force check
continue;
}
if (p3 == pcast) { // _cast<
char *p5 = p1;
while (*p5 && *p5-- > ' ') p2--;
p2++;
p1 += 5; // source buffer pos
*p1 = '(';
p4 = p1;
while (*p4 && *p4 != '>') p4++;
*p4 = ')';
len = p4 - p1;
strncpy(p2, p1, len);
p1 += len; // source buffer pos
p2 += len; // target buffer pos
pcast = strstr(p3 + 6, "_cast<");
p3 = buf1 + BUFSIZE; // force check
continue;
}
if (p3 == plptr) { // ->
p4 = p1 - 1;
while (*p4 && *p4 > ' ') p4--; // find start of pointer name
p4++;
int len1 = p1 - p4; // pointer name len
char *p5 = p1 + 2;
while (*p5 && *p5 != '(' && *p5 != ' ') p5++;
if (*p5 == '(') { // just pointer
p5++;
len = p5 - p1;
strcpy(p2, "->lpVtbl");
p2 += 8;
strncpy(p2, p1, len);
p1 += len; // source buffer pos
p2 += len; // target buffer pos
strncpy(p2, p4, len1);
p2 += len1;
if (*p5 != ')') {
*p2 = ',';
p2++;
}
}
plptr = strstr(p3 + 2, "->");
p3 = buf1 + BUFSIZE; // force check
continue;
}
break;
}
return buf2;
}