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plumber: use strtoul to parse subexpression match variable substitutions

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This commit is contained in:
Igor Burago 2022-10-12 02:39:43 +08:00 committed by Dan Cross
parent 0790296f73
commit a4d35dc3fd
1 changed files with 9 additions and 24 deletions
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33
src/cmd/plumb/rules.c
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@ -254,36 +254,21 @@ filename(Exec *e, char *name)
return cleanname(buf);
}
static char*
subexpmatch(Exec *e, char *s, int *numlen)
{
int n, d, ok;
char *t;
n = 0;
ok = 1;
for(t = s; '0'<=*t && *t<='9'; t++)
if(ok){
d = *t-'0';
if(d<NMATCHSUBEXP && n<=(NMATCHSUBEXP-1-d)/10)
n = 10*n+d;
else
ok = 0;
}
*numlen = t-s;
if(t==s || !ok)
return nil;
return e->match[n];
}
char*
dollar(Exec *e, char *s, int *namelen)
{
int n;
ulong m;
char *t;
static char *abuf;
if(e!=nil && '0'<=s[0] && s[0]<='9')
return nonnil(subexpmatch(e, s, namelen));
if(e!=nil && '0'<=s[0] && s[0]<='9'){
m = strtoul(s, &t, 10);
*namelen = t-s;
if(t==s || m>=NMATCHSUBEXP)
return "";
return nonnil(e->match[m]);
}
n = scanvarname(s)-s;
*namelen = n;