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/* Copyright (c) 2003, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file parse_int.c
* \brief Convert strings into the integers they encode, with bounds checking.
**/
#include "lib/string/parse_int.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/* Helper: common code to check whether the result of a strtol or strtoul or
* strtoll is correct. */
#define CHECK_STRTOX_RESULT() \
/* Did an overflow occur? */ \
if (errno == ERANGE) \
goto err; \
/* Was at least one character converted? */ \
if (endptr == s) \
goto err; \
/* Were there unexpected unconverted characters? */ \
if (!next && *endptr) \
goto err; \
/* Illogical (max, min) inputs? */ \
if (max < min) \
goto err; \
/* Is r within limits? */ \
if (r < min || r > max) \
goto err; \
if (ok) *ok = 1; \
if (next) *next = endptr; \
return r; \
err: \
if (ok) *ok = 0; \
if (next) *next = endptr; \
return 0
/** Extract a long from the start of <b>s</b>, in the given numeric
* <b>base</b>. If <b>base</b> is 0, <b>s</b> is parsed as a decimal,
* octal, or hex number in the syntax of a C integer literal. If
* there is unconverted data and <b>next</b> is provided, set
* *<b>next</b> to the first unconverted character. An error has
* occurred if no characters are converted; or if there are
* unconverted characters and <b>next</b> is NULL; or if the parsed
* value is not between <b>min</b> and <b>max</b>. When no error
* occurs, return the parsed value and set *<b>ok</b> (if provided) to
* 1. When an error occurs, return 0 and set *<b>ok</b> (if provided)
* to 0.
*/
long
tor_parse_long(const char *s, int base, long min, long max,
int *ok, char **next)
{
char *endptr;
long r;
if (base < 0) {
if (ok)
*ok = 0;
return 0;
}
errno = 0;
r = strtol(s, &endptr, base);
CHECK_STRTOX_RESULT();
}
/** As tor_parse_long(), but return an unsigned long. */
unsigned long
tor_parse_ulong(const char *s, int base, unsigned long min,
unsigned long max, int *ok, char **next)
{
char *endptr;
unsigned long r;
if (base < 0) {
if (ok)
*ok = 0;
return 0;
}
errno = 0;
r = strtoul(s, &endptr, base);
CHECK_STRTOX_RESULT();
}
/** As tor_parse_long(), but return a double. */
double
tor_parse_double(const char *s, double min, double max, int *ok, char **next)
{
char *endptr;
double r;
errno = 0;
r = strtod(s, &endptr);
CHECK_STRTOX_RESULT();
}
/** As tor_parse_long, but return a uint64_t. Only base 10 is guaranteed to
* work for now. */
uint64_t
tor_parse_uint64(const char *s, int base, uint64_t min,
uint64_t max, int *ok, char **next)
{
char *endptr;
uint64_t r;
if (base < 0) {
if (ok)
*ok = 0;
return 0;
}
errno = 0;
#ifdef HAVE_STRTOULL
r = (uint64_t)strtoull(s, &endptr, base);
#elif defined(_WIN32)
r = (uint64_t)_strtoui64(s, &endptr, base);
#elif SIZEOF_LONG == 8
r = (uint64_t)strtoul(s, &endptr, base);
#else
#error "I don't know how to parse 64-bit numbers."
#endif /* defined(HAVE_STRTOULL) || ... */
CHECK_STRTOX_RESULT();
}
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