- printf("ttf2png - True Type Font to PNG converter\n"
- "Copyright (c) 2004-2008 Mikko Rasa, Mikkosoft Productions\n"
- "Distributed under the GNU General Public License\n\n"
- "Usage: ttf2png [options] <TTF file>\n\n"
- "Accepted options (default values in [brackets])\n"
- " -r Range of characters to convert in the format low,high [0,255]\n"
- " -s Font size to use, in pixels [10]\n"
- " -l Number of characters to put in one line [auto]\n"
- " -c Character cell size, in pixels [auto]\n"
- " -o Output file name (or - for stdout) [font.png]\n"
- " -a Force autohinter\n"
- " -t Render font to alpha channel\n"
- " -i Invert colors of the glyphs\n"
- " -v Increase the level of verbosity\n"
- " -e Use cells in sequence, rather than by code\n"
- " -p Pack the glyphs tightly instead of in a grid\n"
- " -d Write a definition to the given file\n"
- " -h Print this message\n");
+ void *ptr;
+
+ /* Carry out the multiplication manually so we can check for overflow. */
+ while(b>1)
+ {
+ size_t c = a;
+ a *= 2;
+ if(b&1)
+ a += c;
+ if(a<c)
+ {
+ fprintf(stderr, "Cannot allocate %lu kbytes of memory for image\n", (unsigned long)(c/1024*b));
+ return NULL;
+ }
+ b /= 2;
+ }
+ ptr = malloc(a);
+ if(!ptr)
+ fprintf(stderr, "Cannot allocate %lu kbytes of memory for image\n", (unsigned long)(a/1024*b));
+ return ptr;