/* A more useful interface to strtol. Copyright (C) 1995, 1996, 1998 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 #include #if STDC_HEADERS # include #endif #if HAVE_STRING_H # include #else # include # ifndef strchr # define strchr index # endif #endif /* Some pre-ANSI implementations (e.g. SunOS 4) need stderr defined if assertion checking is enabled. */ #ifndef NDEBUG # include #endif #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)) #ifndef ULONG_MAX # define ULONG_MAX TYPE_MAXIMUM (unsigned long int) #endif #ifndef LONG_MAX # define LONG_MAX TYPE_MAXIMUM (long int) #endif #include "xstrtol.h" __unsigned long int __strtol (); static int bkm_scale (__unsigned long int *x, int scale_factor) { __unsigned long int product = *x * scale_factor; if (*x != product / scale_factor) return 1; *x = product; return 0; } static int bkm_scale_by_power (__unsigned long int *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, __unsigned long int *val, const char *valid_suffixes) { char *t_ptr; char **p; __unsigned long int tmp; assert (0 <= strtol_base && strtol_base <= 36); p = (ptr ? ptr : &t_ptr); 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 one in tail.c 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)) 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 */ 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 backward 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 */ 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: 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 */