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Diffstat (limited to 'mcon/U/d_gconvert.U')
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diff --git a/mcon/U/d_gconvert.U b/mcon/U/d_gconvert.U new file mode 100644 index 0000000..367da20 --- /dev/null +++ b/mcon/U/d_gconvert.U @@ -0,0 +1,147 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic Licence, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic Licence; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: Original Author: Andy Dougherty <doughera@lafcol.lafayette.edu> +?RCS: +?RCS: $Log: d_gconvert.U,v $ +?RCS: Revision 3.0.1.3 1997/02/28 15:33:38 ram +?RCS: patch61: integrated new unit from perl5 +?RCS: +?RCS: Revision 3.0.1.2 1995/07/25 13:55:59 ram +?RCS: patch56: improved comments about the Gconvert macro (ADO) +?RCS: patch56: force compile-link test since it may exist but be unusable (ADO) +?RCS: +?RCS: Revision 3.0.1.1 1994/10/29 16:12:51 ram +?RCS: patch36: created by ADO +?RCS: +?MAKE:d_Gconvert: cat cc ccflags ldflags libs Inlibc rm _o +?MAKE: -pick add $@ %< +?S:d_Gconvert: +?S: This variable holds what Gconvert is defined as to convert +?S: floating point numbers into strings. It could be 'gconvert' +?S: or a more complex macro emulating gconvert with gcvt() or sprintf. +?S:. +?C:Gconvert: +?C: This preprocessor macro is defined to convert a floating point +?C: number to a string without a trailing decimal point. This +?C: emulates the behavior of sprintf("%g"), but is sometimes much more +?C: efficient. If gconvert() is not available, but gcvt() drops the +?C: trailing decimal point, then gcvt() is used. If all else fails, +?C: a macro using sprintf("%g") is used. Arguments for the Gconvert +?C: macro are: value, number of digits, whether trailing zeros should +?C: be retained, and the output buffer. +?C: Possible values are: +?C: d_Gconvert='gconvert((x),(n),(t),(b))' +?C: d_Gconvert='gcvt((x),(n),(b))' +?C: d_Gconvert='sprintf((b),"%.*g",(n),(x))' +?C: The last two assume trailing zeros should not be kept. +?C:. +?H:#define Gconvert(x,n,t,b) $d_Gconvert +?H:. +?T: xxx_list xxx_convert +?F:!try +?X: +: Check how to convert floats to strings. +echo " " +echo "Checking for an efficient way to convert floats to strings." +?X: We want to be sure to drop trailing decimal points (perl5 +?X: needs this). +$cat >try.c <<'EOP' +#ifdef TRY_gconvert +#define Gconvert(x,n,t,b) gconvert((x),(n),(t),(b)) +char *myname = "gconvert"; +#endif +#ifdef TRY_gcvt +#define Gconvert(x,n,t,b) gcvt((x),(n),(b)) +char *myname = "gcvt"; +#endif +#ifdef TRY_sprintf +#define Gconvert(x,n,t,b) sprintf((b),"%.*g",(n),(x)) +char *myname = "sprintf"; +#endif + +#include <stdio.h> + +int +checkit(expect, got) +char *expect; +char *got; +{ + if (strcmp(expect, got)) { + printf("%s oddity: Expected %s, got %s\n", + myname, expect, got); + exit(1); + } +} + +int +int main() +{ + char buf[64]; + buf[63] = '\0'; + + /* This must be 1st test on (which?) platform */ + /* Alan Burlison <AlanBurlsin@unn.unisys.com> */ + Gconvert(0.1, 8, 0, buf); + checkit("0.1", buf); + + Gconvert(1.0, 8, 0, buf); + checkit("1", buf); + + Gconvert(0.0, 8, 0, buf); + checkit("0", buf); + + Gconvert(-1.0, 8, 0, buf); + checkit("-1", buf); + + /* Some Linux gcvt's give 1.e+5 here. */ + Gconvert(100000.0, 8, 0, buf); + checkit("100000", buf); + + /* Some Linux gcvt's give -1.e+5 here. */ + Gconvert(-100000.0, 8, 0, buf); + checkit("-100000", buf); + + exit(0); +} +EOP +?X: List of order in which to search for functions. +?X: Usual order of efficiency is gconvert gcvt sprintf +?X: Respect a previous or hinted value. +case "$d_Gconvert" in +gconvert*) xxx_list='gconvert gcvt sprintf' ;; +gcvt*) xxx_list='gcvt gconvert sprintf' ;; +sprintf*) xxx_list='sprintf gconvert gcvt' ;; +*) xxx_list='gconvert gcvt sprintf' ;; +esac + +for xxx_convert in $xxx_list; do + echo "Trying $xxx_convert" + $rm -f try try$_o + if $cc $ccflags -DTRY_$xxx_convert $ldflags -o try \ + try.c $libs > /dev/null 2>&1 ; then + echo "$xxx_convert" found. >&4 + if ./try; then + echo "I'll use $xxx_convert to convert floats into a string." >&4 + break; + else + echo "...But $xxx_convert didn't work as I expected." + fi + else + echo "$xxx_convert NOT found." >&4 + fi +done + +case "$xxx_convert" in +gconvert) d_Gconvert='gconvert((x),(n),(t),(b))' ;; +gcvt) d_Gconvert='gcvt((x),(n),(b))' ;; +*) d_Gconvert='sprintf((b),"%.*g",(n),(x))' ;; +esac + |