diff options
Diffstat (limited to 'gnu/usr.bin/groff/libgroff/iftoa.c')
-rw-r--r-- | gnu/usr.bin/groff/libgroff/iftoa.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/gnu/usr.bin/groff/libgroff/iftoa.c b/gnu/usr.bin/groff/libgroff/iftoa.c new file mode 100644 index 0000000..ac37183 --- /dev/null +++ b/gnu/usr.bin/groff/libgroff/iftoa.c @@ -0,0 +1,65 @@ +/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc. + Written by James Clark (jjc@jclark.com) + +This file is part of groff. + +groff is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, or (at your option) any later +version. + +groff is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License along +with groff; see the file COPYING. If not, write to the Free Software +Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#define INT_DIGITS 19 /* enough for 64-bit integer */ + +char *iftoa(i, decimal_point) + int i, decimal_point; +{ + /* room for a -, INT_DIGITS digits, a decimal point, and a terminating '\0' */ + static char buf[INT_DIGITS + 3]; + char *p = buf + INT_DIGITS + 2; + int point = 0; + buf[INT_DIGITS + 2] = '\0'; + /* assert(decimal_point <= INT_DIGITS); */ + if (i >= 0) { + do { + *--p = '0' + (i % 10); + i /= 10; + if (++point == decimal_point) + *--p = '.'; + } while (i != 0 || point < decimal_point); + } + else { /* i < 0 */ + do { + *--p = '0' - (i % 10); + i /= 10; + if (++point == decimal_point) + *--p = '.'; + } while (i != 0 || point < decimal_point); + *--p = '-'; + } + if (decimal_point > 0) { + char *q; + /* there must be a dot, so this will terminate */ + for (q = buf + INT_DIGITS + 2; q[-1] == '0'; --q) + ; + if (q[-1] == '.') { + if (q - 1 == p) { + q[-1] = '0'; + q[0] = '\0'; + } + else + q[-1] = '\0'; + } + else + *q = '\0'; + } + return p; +} |