drawterm/libmemdraw/openmemsubfont.c

54 lines
900 B
C

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
Memsubfont*
openmemsubfont(char *name)
{
Memsubfont *sf;
Memimage *i;
Fontchar *fc;
int fd, n;
char hdr[3*12+4+1];
uchar *p;
fd = open(name, OREAD);
if(fd < 0)
return nil;
p = nil;
i = readmemimage(fd);
if(i == nil)
goto Err;
if(read(fd, hdr, 3*12) != 3*12){
werrstr("openmemsubfont: header read error: %r");
goto Err;
}
n = atoi(hdr);
p = malloc(6*(n+1));
if(p == nil)
goto Err;
if(read(fd, p, 6*(n+1)) != 6*(n+1)){
werrstr("openmemsubfont: fontchar read error: %r");
goto Err;
}
fc = malloc(sizeof(Fontchar)*(n+1));
if(fc == nil)
goto Err;
_unpackinfo(fc, p, n);
sf = allocmemsubfont(name, n, atoi(hdr+12), atoi(hdr+24), fc, i);
if(sf == nil){
free(fc);
goto Err;
}
free(p);
return sf;
Err:
close(fd);
if (i != nil)
freememimage(i);
if (p != nil)
free(p);
return nil;
}