From 42c352d6258bc3ec26c19183c29b5a4ac4301a81 Mon Sep 17 00:00:00 2001 From: dkf Date: Sun, 23 Dec 2012 08:17:17 +0000 Subject: Change back to using an isDigit function. We simply don't need to make any (formally non-portable) assumptions about what happens when an unsigned zero is decremented, and the code isn't in a performance-critical area. Remark by jan.nijtmans: The macro is perfectly portable! Not portable is the exact result of the substraction ('\xB0' - '0' might give 0x80 on some platforms and 0xffffff80 on others), but comparing <= 9 always gives the correct result. We are only checking for digits here! The macro correctly inlines with any compiler, so it's better anyway. Remark by dkf: But it's less clear. In this code, that's more important than a teeny bit of speed from inlining in a non-critical location. --- generic/tclStubLib.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/generic/tclStubLib.c b/generic/tclStubLib.c index f61e0ca..859cbf9 100644 --- a/generic/tclStubLib.c +++ b/generic/tclStubLib.c @@ -24,10 +24,13 @@ const TclIntStubs *tclIntStubsPtr = NULL; const TclIntPlatStubs *tclIntPlatStubsPtr = NULL; /* - * Use our own ISDIGIT to avoid linking to libc on windows + * Use our own isDigit to avoid linking to libc on windows */ -#define ISDIGIT(c) (((unsigned)((c)-'0')) <= 9) +static int isDigit(const int c) +{ + return (c >= '0' && c <= '9'); +} /* *---------------------------------------------------------------------- @@ -79,7 +82,7 @@ Tcl_InitStubs( int count = 0; while (*p) { - count += !ISDIGIT(*p++); + count += !isDigit(*p++); } if (count == 1) { const char *q = actualVersion; @@ -88,7 +91,7 @@ Tcl_InitStubs( while (*p && (*p == *q)) { p++; q++; } - if (*p || ISDIGIT(*q)) { + if (*p || isDigit(*q)) { /* Construct error message */ stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL); return NULL; -- cgit v0.12