From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 31 Mar 2021 11:16:13 +0000 (+0300)
Subject: Accept 0 as a valid code point
X-Git-Url: http://git.tdb.fi/?p=ttf2png.git;a=commitdiff_plain;h=e80f88a25e4c1e3f91be435636be4267ba6ab9ec

Accept 0 as a valid code point

I don't expect any fonts to have an actual glyph there, but it is
technically valid.
---

diff --git a/ttf2png.c b/ttf2png.c
index 0c1c09a..2783811 100644
--- a/ttf2png.c
+++ b/ttf2png.c
@@ -73,7 +73,7 @@ typedef unsigned char bool;
 void usage(void);
 int convert_numeric_option(char, int);
 void convert_code_point_range(char, Range *);
-unsigned str_to_code_point(const char *, char **);
+int str_to_code_point(const char *, char **);
 void convert_size(char, unsigned *, unsigned *);
 void sort_and_compact_ranges(Range *, unsigned *);
 int range_cmp(const void *, const void *);
@@ -344,11 +344,11 @@ void convert_code_point_range(char opt, Range *range)
 	}
 
 	value = str_to_code_point(optarg, &ptr);
-	if(value>0 && *ptr==',')
+	if(value>=0 && *ptr==',')
 	{
 		range->first = value;
 		value = str_to_code_point(ptr+1, &ptr);
-		if(value>0 && !*ptr)
+		if(value>=0 && !*ptr)
 		{
 			range->last = value;
 			return;
@@ -359,7 +359,7 @@ void convert_code_point_range(char opt, Range *range)
 	exit(1);
 }
 
-unsigned str_to_code_point(const char *nptr, char **endptr)
+int str_to_code_point(const char *nptr, char **endptr)
 {
 	if(nptr[0]=='U' && nptr[1]=='+')
 		return strtoul(nptr+2, endptr, 16);
@@ -374,9 +374,9 @@ unsigned str_to_code_point(const char *nptr, char **endptr)
 
 		for(bytes=1; (bytes<4 && (nptr[0]&(0x80>>bytes))); ++bytes)
 			if((nptr[bytes]&0xC0)!=0x80)
-				return 0;
+				return -1;
 		if(bytes<2)
-			return 0;
+			return -1;
 
 		code = nptr[0]&(0x3F>>bytes);
 		for(i=1; i<bytes; ++i)