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Fix for br977 - preprocessor macros substitute text inside token. 

When replacing macro formal parameters, the preprocessor should not
replace matching strings that are not complete tokens. The test for
this was incorrect, and failed when a match was found at the start
of the replacement text.
This commit is contained in:
Martin Whitaker 2015-05-17 20:05:45 +01:00
parent c75498b1d4
commit a479bd6b16
1 changed files with 7 additions and 6 deletions
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13
ivlpp/lexor.lex
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@ -950,6 +950,11 @@ static size_t magic_cnt = 0;
#define _STR1(x) #x
#define _STR2(x) _STR1(x)
static int is_id_char(char c)
{
return isalnum((int)c) || c == '_' || c == '$';
}
/*
* Find an argument, but only if it is not directly preceded by something
* that would make it part of another simple identifier ([a-zA-Z0-9_$]).
@ -964,12 +969,8 @@ static char *find_arg(char*ptr, char*head, char*arg)
cp = strstr(cp, arg);
if (!cp) break;
/* If we are not at the start of the string verify that this
* match is not in the middle of another identifier.
*/
if (cp != head &&
(isalnum((int)*(cp-1)) || *(cp-1) == '_' || *(cp-1) == '$' ||
isalnum((int)*(cp+len)) || *(cp+len) == '_' || *(cp+len) == '$')) {
/* Verify that this match is not in the middle of another identifier. */
if ((cp != head && is_id_char(cp[-1])) || is_id_char(cp[len])) {
cp++;
continue;
}