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Add some more comments to substvar in service_scan.cc.

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david
2009-08-29 14:35:50 +00:00
parent 325a5231a5
commit 32db650a4b
1 changed files with 5 additions and 3 deletions
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8
service_scan.cc
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@@ -556,9 +556,9 @@ static int getsubstcommandargs(struct substargs *args, char *args_start,
}
// This function does the actual substitution of a placeholder like $2
// or $U(4) into the given buffer. It returns the number of chars
// or $P(4) into the given buffer. It returns the number of chars
// written, or -1 if it fails. tmplvar is a template variable, such
// as "$U(2)". We determine the appropriate string representing that,
// as "$P(2)". We determine the appropriate string representing that,
// and place it in newstr (as long as it doesn't exceed newstrlen).
// We then set *tmplvarend to the character after the
// variable. subject, subjectlen, ovector, and nummatches mean the
@@ -566,7 +566,6 @@ static int getsubstcommandargs(struct substargs *args, char *args_start,
static int substvar(char *tmplvar, char **tmplvarend, char *newstr,
int newstrlen, const u8 *subject, int subjectlen, int *ovector,
int nummatches) {
char substcommand[16];
char *p = NULL;
char *p_end;
@@ -582,6 +581,7 @@ static int substvar(char *tmplvar, char **tmplvarend, char *newstr,
tmplvar++;
if (!isdigit((int) (unsigned char) *tmplvar)) {
/* This is a command like $P(1). */
p = strchr(tmplvar, '(');
if (!p) return -1;
len = p - tmplvar;
@@ -595,6 +595,7 @@ static int substvar(char *tmplvar, char **tmplvarend, char *newstr,
if (rc <= 0) return -1;
tmplvar = p_end;
} else {
/* This is a placeholder like $2. */
substcommand[0] = '\0';
subnum = *tmplvar - '0';
tmplvar++;
@@ -603,6 +604,7 @@ static int substvar(char *tmplvar, char **tmplvarend, char *newstr,
if (tmplvarend) *tmplvarend = tmplvar;
if (!*substcommand) {
/* Handler for a placeholder like $2. */
if (subnum > 9 || subnum <= 0) return -1;
if (subnum >= nummatches) return -1;
offstart = ovector[subnum * 2];