From: Paul Eggert Date: Mon, 18 Dec 2000 23:43:51 +0000 (+0000) Subject: Initial revision X-Git-Url: https://git.dogcows.com/gitweb?a=commitdiff_plain;h=1ff433e49eae96e2a3fb16eff2da5b837f9f1e06;p=chaz%2Ftar Initial revision --- diff --git a/lib/xstrtol.c b/lib/xstrtol.c new file mode 100644 index 0000000..7bc7335 --- /dev/null +++ b/lib/xstrtol.c @@ -0,0 +1,284 @@ +/* A more useful interface to strtol. + Copyright (C) 1995, 1996, 1998-2000 Free Software Foundation, Inc. + + This program 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. + + This program 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 this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Jim Meyering. */ + +#if HAVE_CONFIG_H +# include +#endif + +#ifndef __strtol +# define __strtol strtol +# define __strtol_t long int +# define __xstrtol xstrtol +#endif + +/* Some pre-ANSI implementations (e.g. SunOS 4) + need stderr defined if assertion checking is enabled. */ +#include + +#if STDC_HEADERS +# include +#endif + +#if HAVE_STRING_H +# include +#else +# include +# ifndef strchr +# define strchr index +# endif +#endif + +#include +#include + +#include +#ifndef errno +extern int errno; +#endif + +#if HAVE_LIMITS_H +# include +#endif + +#ifndef CHAR_BIT +# define CHAR_BIT 8 +#endif + +/* The extra casts work around common compiler bugs. */ +#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) +/* The outer cast is needed to work around a bug in Cray C 5.0.3.0. + It is necessary at least when t == time_t. */ +#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \ + ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0)) +#define TYPE_MAXIMUM(t) (~ (t) 0 - TYPE_MINIMUM (t)) + +#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) +# define IN_CTYPE_DOMAIN(c) 1 +#else +# define IN_CTYPE_DOMAIN(c) isascii(c) +#endif + +#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) + +#include "xstrtol.h" + +#ifndef strtol +long int strtol (); +#endif + +#ifndef strtoul +unsigned long int strtoul (); +#endif + +#ifndef strtoumax +uintmax_t strtoumax (); +#endif + +static int +bkm_scale (__strtol_t *x, int scale_factor) +{ + __strtol_t product = *x * scale_factor; + if (*x != product / scale_factor) + return 1; + *x = product; + return 0; +} + +static int +bkm_scale_by_power (__strtol_t *x, int base, int power) +{ + while (power--) + if (bkm_scale (x, base)) + return 1; + + return 0; +} + +/* FIXME: comment. */ + +strtol_error +__xstrtol (const char *s, char **ptr, int strtol_base, + __strtol_t *val, const char *valid_suffixes) +{ + char *t_ptr; + char **p; + __strtol_t tmp; + + assert (0 <= strtol_base && strtol_base <= 36); + + p = (ptr ? ptr : &t_ptr); + + if (! TYPE_SIGNED (__strtol_t)) + { + const char *q = s; + while (ISSPACE ((unsigned char) *q)) + ++q; + if (*q == '-') + return LONGINT_INVALID; + } + + errno = 0; + tmp = __strtol (s, p, strtol_base); + if (errno != 0) + return LONGINT_OVERFLOW; + if (*p == s) + return LONGINT_INVALID; + + /* Let valid_suffixes == NULL mean `allow any suffix'. */ + /* FIXME: update all callers except the ones that allow suffixes + after the number, changing last parameter NULL to `""'. */ + if (!valid_suffixes) + { + *val = tmp; + return LONGINT_OK; + } + + if (**p != '\0') + { + int base = 1024; + int suffixes = 1; + int overflow; + + if (!strchr (valid_suffixes, **p)) + { + *val = tmp; + return LONGINT_INVALID_SUFFIX_CHAR; + } + + if (strchr (valid_suffixes, '0')) + { + /* The ``valid suffix'' '0' is a special flag meaning that + an optional second suffix is allowed, which can change + the base, e.g. "100MD" for 100 megabytes decimal. */ + + switch (p[0][1]) + { + case 'B': + suffixes++; + break; + + case 'D': + base = 1000; + suffixes++; + break; + } + } + + switch (**p) + { + case 'b': + overflow = bkm_scale (&tmp, 512); + break; + + case 'B': + overflow = bkm_scale (&tmp, 1024); + break; + + case 'c': + overflow = 0; + break; + + case 'E': /* Exa */ + overflow = bkm_scale_by_power (&tmp, base, 6); + break; + + case 'G': /* Giga */ + case 'g': /* 'g' is undocumented; for compatibility only */ + overflow = bkm_scale_by_power (&tmp, base, 3); + break; + + case 'k': /* kilo */ + overflow = bkm_scale_by_power (&tmp, base, 1); + break; + + case 'M': /* Mega */ + case 'm': /* 'm' is undocumented; for compatibility only */ + overflow = bkm_scale_by_power (&tmp, base, 2); + break; + + case 'P': /* Peta */ + overflow = bkm_scale_by_power (&tmp, base, 5); + break; + + case 'T': /* Tera */ + case 't': /* 't' is undocumented; for compatibility only */ + overflow = bkm_scale_by_power (&tmp, base, 4); + break; + + case 'w': + overflow = bkm_scale (&tmp, 2); + break; + + case 'Y': /* Yotta */ + overflow = bkm_scale_by_power (&tmp, base, 8); + break; + + case 'Z': /* Zetta */ + overflow = bkm_scale_by_power (&tmp, base, 7); + break; + + default: + *val = tmp; + return LONGINT_INVALID_SUFFIX_CHAR; + break; + } + + if (overflow) + return LONGINT_OVERFLOW; + + (*p) += suffixes; + } + + *val = tmp; + return LONGINT_OK; +} + +#ifdef TESTING_XSTRTO + +# include +# include "error.h" + +char *program_name; + +int +main (int argc, char** argv) +{ + strtol_error s_err; + int i; + + program_name = argv[0]; + for (i=1; i%lu (%s)\n", argv[i], val, p); + } + else + { + STRTOL_FATAL_ERROR (argv[i], "arg", s_err); + } + } + exit (0); +} + +#endif /* TESTING_XSTRTO */