From 40adef9e5923888b9ae220f94cdb0a6331b8a9a7 Mon Sep 17 00:00:00 2001 From: Ed Maste Date: Fri, 23 Aug 2019 16:03:23 +0000 Subject: vtfontcvt: simplify rshift_row We don't need to specify the buffer size in both bytes and bits. MFC after: 1 week Sponsored by: The FreeBSD Foundation --- usr.bin/vtfontcvt/vtfontcvt.c | 43 ++++++++++--------------------------------- 1 file changed, 10 insertions(+), 33 deletions(-) (limited to 'usr.bin/vtfontcvt') diff --git a/usr.bin/vtfontcvt/vtfontcvt.c b/usr.bin/vtfontcvt/vtfontcvt.c index e34308d5d365..7553d66d99d2 100644 --- a/usr.bin/vtfontcvt/vtfontcvt.c +++ b/usr.bin/vtfontcvt/vtfontcvt.c @@ -224,38 +224,19 @@ add_char(unsigned curchar, unsigned map_idx, uint8_t *bytes, uint8_t *bytes_r) } /* - * Right-shift glyph row by _shift_ bits. Row _len_ bits wide, _size_ bytes. + * Right-shift glyph row. */ -static int -rshift_row(uint8_t *line, size_t size, size_t len, size_t shift) +static void +rshift_row(uint8_t *buf, size_t len, size_t shift) { - size_t d, s, i; - uint16_t t; - - assert(size > 0 && len > 0); - assert(size * 8 >= len); + ssize_t i, off_byte = shift / 8; + size_t off_bit = shift % 8; if (shift == 0) - return (0); - - d = shift / 8; - s = 8 - shift % 8; - i = howmany(len, 8); - - while (i > 0) { - i--; - - t = *(line + i); - *(line + i) = 0; - - t <<= s; - - if (i + d + 1 < size) - *(line + i + d + 1) |= (uint8_t)t; - if (i + d < size) - *(line + i + d) = t >> 8; - } - return (0); + return; + for (i = len - 1; i >= 0; i--) + buf[i] = (i >= off_byte ? buf[i - off_byte] >> off_bit : 0) | + (i > off_byte ? buf[i - off_byte - 1] << (8 - off_bit) : 0); } /* @@ -426,11 +407,7 @@ parse_bdf(FILE *fp, unsigned int map_idx) *(line + j) = (uint8_t)val; } - rv = rshift_row(line, wbytes * 2, bbw, - bbox - fbbox); - if (rv != 0) - goto out; - + rshift_row(line, wbytes * 2, bbox - fbbox); rv = split_row(bytes + i * wbytes, bytes_r + i * wbytes, line, dwidth); if (rv != 0) -- cgit v1.2.3