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Diffstat (limited to 'private/windbg/lib/strtoli.c')
| -rw-r--r-- | private/windbg/lib/strtoli.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/private/windbg/lib/strtoli.c b/private/windbg/lib/strtoli.c new file mode 100644 index 000000000..9d834c39f --- /dev/null +++ b/private/windbg/lib/strtoli.c @@ -0,0 +1,242 @@ +/*** +*strtoli.c - Contains C runtimes strtol and strtoul +* +* Copyright (c) 1989-1993, Microsoft Corporation. All rights reserved. +* Copyright (c) 1989-1993, Digital Equipment Corporation. All rights reserved. +* +*Purpose: +* strtoli - convert ascii string to long signed large integer +* strtouli - convert ascii string to long unsigned large integer +* +*Revision History: +* 04-28-93 MBH Module created, based on strtol.c +* +*******************************************************************************/ + + +#include <nt.h> +#include <ntrtl.h> +#include <nturtl.h> +#include <ntdbg.h> + + +#include <windows.h> +#include <shellapi.h> + + + + +// #include <cruntime.h> +#include <stdlib.h> +#include <limits.h> +#include <errno.h> +#include <ctype.h> + + +/*** +*strtoli, strtouli(nptr,endptr,ibase) - Convert ascii string to long un/signed +* large integer. +* +*Purpose: +* Convert an ascii string to a long 64-bit value. The base +* used for the caculations is supplied by the caller. The base +* must be in the range 0, 2-36. If a base of 0 is supplied, the +* ascii string must be examined to determine the base of the +* number: +* (a) First char = '0', second char = 'x' or 'X', +* use base 16. +* (b) First char = '0', use base 8 +* (c) First char in range '1' - '9', use base 10. +* +* If the 'endptr' value is non-NULL, then strtoli/strtouli places +* a pointer to the terminating character in this value. +* See ANSI standard for details +* +*Entry: +* nptr == NEAR/FAR pointer to the start of string. +* endptr == NEAR/FAR pointer to the end of the string. +* ibase == integer base to use for the calculations. +* +* string format: [whitespace] [sign] [0] [x] [digits/letters] +* +*Exit: +* Good return: +* result +* +* Overflow return: +* strtoli -- LONG_MAX or LONG_MIN in HighPart +* strtouli -- ULONG_MAX in HighPart +* strtoli/strtouli -- errno == ERANGE +* +* No digits or bad base return: +* 0 +* endptr = nptr* +* +*Exceptions: +* None. +*******************************************************************************/ + +/* flag values */ +#define FL_UNSIGNED 1 /* strtoul called */ +#define FL_NEG 2 /* negative sign found */ +#define FL_OVERFLOW 4 /* overflow occured */ +#define FL_READDIGIT 8 /* we've read at least one correct digit */ + +static +LARGE_INTEGER +// MBH - if this is a library, this should be CRTAPI3 +_CRTAPI2 strtoxl ( + const char *nptr, + const char **endptr, + int ibase, + int flags + ) +{ + const char *p; + char c; + + LARGE_INTEGER number; // being computed + unsigned long digval; // each digit in turn + LARGE_INTEGER maxval; // value more than which --> overflow + LARGE_INTEGER maxli; // largest possible large integer + unsigned long remainder; // maxli=maxval/radix + remainder + + p = nptr; /* p is our scanning pointer */ + number.QuadPart = 0; + maxli.QuadPart = -1; + + c = *p++; /* read char */ + while ( isspace((int)(unsigned char)c) ) + c = *p++; /* skip whitespace */ + + if (c == '-') { + flags |= FL_NEG; /* remember minus sign */ + c = *p++; + } + else if (c == '+') + c = *p++; /* skip sign */ + + if (ibase < 0 || ibase == 1 || ibase > 36) { + /* bad base! */ + if (endptr) + /* store beginning of string in endptr */ + *endptr = nptr; + number.QuadPart = 0; + return number; + } + else if (ibase == 0) { + /* determine base free-lance, based on first two chars of + string */ + if (c != '0') + ibase = 10; + else if (*p == 'x' || *p == 'X') + ibase = 16; + else + ibase = 8; + } + + if (ibase == 16) { + /* we might have 0x in front of number; remove if there */ + if (c == '0' && (*p == 'x' || *p == 'X')) { + ++p; + c = *p++; /* advance past prefix */ + } + } + + /* if our number exceeds this, we will overflow on multiply */ + maxval.QuadPart = maxli.QuadPart / ibase; + remainder = (unsigned long)(maxli.QuadPart - maxval.QuadPart); + + for (;;) { /* exit in middle of loop */ + /* convert c to value */ + if ( isdigit((int)(unsigned char)c) ) + digval = c - '0'; + else if ( isalpha((int)(unsigned char)c) ) + digval = toupper(c) - 'A' + 10; + else + break; + if (digval >= (unsigned)ibase) + break; /* exit loop if bad digit found */ + + /* record the fact we have read one digit */ + flags |= FL_READDIGIT; + + /* we now need to compute number = number * base + digval, + but we need to know if overflow occured. This requires + a tricky pre-check. */ + + if (number.QuadPart <= maxval.QuadPart && digval <= remainder) { + // + // we won't overflow, go ahead and multiply + // + number.QuadPart = (number.QuadPart * ibase) + digval; + } else { + // + // we would have overflowed -- set the overflow flag + // + flags |= FL_OVERFLOW; + } + + c = *p++; /* read next digit */ + } + + --p; /* point to place that stopped scan */ + + if (!(flags & FL_READDIGIT)) { + /* no number there; return 0 and point to beginning of + string */ + if (endptr) + /* store beginning of string in endptr later on */ + p = nptr; + /* return 0 */ + number.QuadPart = 0; + } + else if ((flags & FL_OVERFLOW) || (!(flags & FL_UNSIGNED) && (number.QuadPart < 0))) { + + /* overflow occurred or signed overflow occurred */ + errno = ERANGE; + if (flags & FL_UNSIGNED) + number.QuadPart = maxli.QuadPart >> 1; + else + /* set error code, will be negated if necc. */ + number = maxli; + } + + if (endptr != NULL) + /* store pointer to char that stopped the scan */ + *endptr = p; + + if (flags & FL_NEG) + /* negate result if there was a neg sign */ + number.QuadPart = number.QuadPart * -1; + + return number; /* done. */ +} + +LARGE_INTEGER +// _CRTAPI1 +strtoli ( + const char *nptr, + char **endptr, + int ibase + ) +{ + return strtoxl(nptr, endptr, ibase, 0); +} + +ULARGE_INTEGER +// _CRTAPI1 +strtouli ( + const char *nptr, + char **endptr, + int ibase + ) +{ + ULARGE_INTEGER uli; + LARGE_INTEGER li; + + li = strtoxl(nptr, endptr, ibase, FL_UNSIGNED); + uli.LowPart = li.LowPart; + uli.HighPart = li.HighPart; + return uli; +} |