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 0c1c09a490f0dd675c000496b2f7fd3cc6159e5c..27838112917fe5b3d854e7e03b6a80efccf40a3c 100644 (file)
--- 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)