diff options
Diffstat (limited to 'compat/strtoll.c')
-rw-r--r-- | compat/strtoll.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/compat/strtoll.c b/compat/strtoll.c new file mode 100644 index 0000000..ce1c8a1 --- /dev/null +++ b/compat/strtoll.c @@ -0,0 +1,107 @@ +/* + * strtoll.c -- + * + * Source code for the "strtoll" library procedure. + * + * Copyright (c) 1988 The Regents of the University of California. + * Copyright (c) 1994 Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * RCS: @(#) $Id: strtoll.c,v 1.9 2007/04/16 13:36:34 dkf Exp $ + */ + +#include "tclInt.h" +#include <ctype.h> + +#define TCL_WIDEINT_MAX (((Tcl_WideUInt)Tcl_LongAsWide(-1))>>1) + + +/* + *---------------------------------------------------------------------- + * + * strtoll -- + * + * Convert an ASCII string into an integer. + * + * Results: + * The return value is the integer equivalent of string. If endPtr is + * non-NULL, then *endPtr is filled in with the character after the last + * one that was part of the integer. If string doesn't contain a valid + * integer value, then zero is returned and *endPtr is set to string. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +#if TCL_WIDE_INT_IS_LONG +long long +#else +Tcl_WideInt +#endif +strtoll( + CONST char *string, /* String of ASCII digits, possibly preceded + * by white space. For bases greater than 10, + * either lower- or upper-case digits may be + * used. */ + char **endPtr, /* Where to store address of terminating + * character, or NULL. */ + int base) /* Base for conversion. Must be less than 37. + * If 0, then the base is chosen from the + * leading characters of string: "0x" means + * hex, "0" means octal, anything else means + * decimal. */ +{ + register CONST char *p; + Tcl_WideInt result = Tcl_LongAsWide(0); + Tcl_WideUInt uwResult; + + /* + * Skip any leading blanks. + */ + + p = string; + while (isspace(UCHAR(*p))) { + p += 1; + } + + /* + * Check for a sign. + */ + + errno = 0; + if (*p == '-') { + p += 1; + uwResult = strtoull(p, endPtr, base); + if (errno != ERANGE) { + if (uwResult > TCL_WIDEINT_MAX+1) { + errno = ERANGE; + return Tcl_LongAsWide(-1); + } else if (uwResult > TCL_WIDEINT_MAX) { + return ~((Tcl_WideInt)TCL_WIDEINT_MAX); + } else { + result = -((Tcl_WideInt) uwResult); + } + } + } else { + if (*p == '+') { + p += 1; + } + uwResult = strtoull(p, endPtr, base); + if (errno != ERANGE) { + if (uwResult > TCL_WIDEINT_MAX) { + errno = ERANGE; + return Tcl_LongAsWide(-1); + } else { + result = uwResult; + } + } + } + if ((result == 0) && (endPtr != 0) && (*endPtr == p)) { + *endPtr = (char *) string; + } + return result; +} |