Commit d468ef18 authored by Ulrich Huber's avatar Ulrich Huber Committed by Oliver Horst
Browse files

[add] atof strtol implementation and some missing types

parent f9479e00
......@@ -23,6 +23,8 @@ void srandom(unsigned int seed);
* String conversion routines
*/
int atoi(const char *str);
double atof(const char *str);
long int strtol(const char *nptr, char **endptr, int base);
#ifdef __cplusplus
}
......
......@@ -23,4 +23,12 @@ typedef long signed int ssize_t;
#define _SSIZE_T_DECLARED
#endif
#ifndef __u_char_defined
#define __u_char_defined
typedef unsigned long u_long;
typedef unsigned int u_int;
typedef unsigned short u_short;
typedef unsigned char u_char;
#endif
#endif //TOKI_TYPES_H
cmake_minimum_required(VERSION 3.7 FATAL_ERROR)
add_subdirectory(ctype)
add_subdirectory(math)
add_subdirectory(printf)
add_subdirectory(stdlib)
add_subdirectory(string)
add_subdirectory(math)
......@@ -4,7 +4,9 @@ target_sources(
toki-libc-repl
#
PRIVATE
"${CMAKE_CURRENT_LIST_DIR}/atof.c"
"${CMAKE_CURRENT_LIST_DIR}/atoi.c"
"${CMAKE_CURRENT_LIST_DIR}/calloc.c"
"${CMAKE_CURRENT_LIST_DIR}/rand.c"
"${CMAKE_CURRENT_LIST_DIR}/strtol.c"
)
-------------------------------------------------------------------------------
Files:
- atof.c
- atoi.c
- calloc.c
- rand.c
BSD with Attribution License
Copyright (c) 2015-2020 fortiss GmbH - Research Institute of the
......@@ -38,3 +45,48 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
SPDX-License-Identifier: BSD-3-Clause-Attribution
-------------------------------------------------------------------------------
Files:
- strtol.c
BSD 4-Clause Original License
Copyright (c) 1990 The Regents of the University of California.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
SPDX-License-Identifier: BSD-4-Clause
#include <stdlib.h>
double atof(const char *str) {
int i,digits_past_dp,flag_past_dp;
double val;
char c;
i = digits_past_dp = flag_past_dp = 0;
val = 0.0;
// Iterate through string and calculate the value
while ((c = *(str + i)) != '\0'){
// Handle decimal point special
if (c != '.'){
// For each digit multiply old value by ten and add digit
val = (val * 10) + (c - '0');
// Count the digits after decimal point
if (flag_past_dp) {
--digits_past_dp;
}
}
else {
// Handle decimal point
// Second decimal point encountered
if (flag_past_dp) {
return 0.0;
}
flag_past_dp = 1;
}
++i;
}
/*
* TODO val = val * pow(10, digis_past_dp) would be nicer but implementing
* pow just for this is not worth it...
*/
for (; digits_past_dp < 0; ++digits_past_dp) {
val = val / 10;
}
return val;
}
\ No newline at end of file
/*
FUNCTION
<<strtol>>, <<strtol_l>>---string to long
INDEX
strtol
SYNOPSIS
#include <stdlib.h>
long strtol(const char *restrict <[s]>, char **restrict <[ptr]>,
int <[base]>);
#include <stdlib.h>
long strtol_l(const char *restrict <[s]>, char **restrict <[ptr]>,
int <[base]>, locale_t <[locale]>);
long _strtol_r(void *<[reent]>, const char *restrict <[s]>,
char **restrict <[ptr]>,int <[base]>);
DESCRIPTION
The function <<strtol>> converts the string <<*<[s]>>> to
a <<long>>. First, it breaks down the string into three parts:
leading whitespace, which is ignored; a subject string consisting
of characters resembling an integer in the radix specified by <[base]>;
and a trailing portion consisting of zero or more unparseable characters,
and always including the terminating null character. Then, it attempts
to convert the subject string into a <<long>> and returns the
result.
If the value of <[base]> is 0, the subject string is expected to look
like a normal C integer constant: an optional sign, a possible `<<0x>>'
indicating a hexadecimal base, and a number. If <[base]> is between
2 and 36, the expected form of the subject is a sequence of letters
and digits representing an integer in the radix specified by <[base]>,
with an optional plus or minus sign. The letters <<a>>--<<z>> (or,
equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35;
only letters whose ascribed values are less than <[base]> are
permitted. If <[base]> is 16, a leading <<0x>> is permitted.
The subject sequence is the longest initial sequence of the input
string that has the expected form, starting with the first
non-whitespace character. If the string is empty or consists entirely
of whitespace, or if the first non-whitespace character is not a
permissible letter or digit, the subject string is empty.
If the subject string is acceptable, and the value of <[base]> is zero,
<<strtol>> attempts to determine the radix from the input string. A
string with a leading <<0x>> is treated as a hexadecimal value; a string with
a leading 0 and no <<x>> is treated as octal; all other strings are
treated as decimal. If <[base]> is between 2 and 36, it is used as the
conversion radix, as described above. If the subject string begins with
a minus sign, the value is negated. Finally, a pointer to the first
character past the converted subject string is stored in <[ptr]>, if
<[ptr]> is not <<NULL>>.
If the subject string is empty (or not in acceptable form), no conversion
is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
not <<NULL>>).
<<strtol_l>> is like <<strtol>> but performs the conversion based on the
locale specified by the locale object locale. If <[locale]> is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
The alternate function <<_strtol_r>> is a reentrant version. The
extra argument <[reent]> is a pointer to a reentrancy structure.
RETURNS
<<strtol>>, <<strtol_l>> return the converted value, if any. If no
conversion was made, 0 is returned.
<<strtol>>, <<strtol_l>> return <<LONG_MAX>> or <<LONG_MIN>> if the
magnitude of the converted value is too large, and sets <<errno>>
to <<ERANGE>>.
PORTABILITY
<<strtol>> is ANSI.
<<strtol_l>> is a GNU extension.
No supporting OS subroutines are required.
*/
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <ctype.h>
long int strtol(const char *nptr, char **endptr, int base) {
register const unsigned char *s = (const unsigned char *) nptr;
register unsigned long int acc;
register int c;
register unsigned long int cutoff;
register int neg = 0, any, cutlim;
/*
* Skip white space and pick up leading +/- sign if any.
* If base is 0, allow 0x for hex and 0 for octal, else
* assume decimal; if base is already 16, allow 0x.
*/
do {
c = *s++;
} while (isspace(c));
if (c == '-') {
neg = 1;
c = *s++;
} else if (c == '+')
c = *s++;
if ((base == 0 || base == 16) &&
c == '0' && (*s == 'x' || *s == 'X')) {
c = s[1];
s += 2;
base = 16;
}
if (base == 0)
base = c == '0' ? 8 : 10;
/*
* Compute the cutoff value between legal numbers and illegal
* numbers. That is the largest legal value, divided by the
* base. An input number that is greater than this value, if
* followed by a legal input character, is too big. One that
* is equal to this value may be valid or not; the limit
* between valid and invalid numbers is then based on the last
* digit. For instance, if the range for longs is
* [-2147483648..2147483647] and the input base is 10,
* cutoff will be set to 214748364 and cutlim to either
* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
* a value > 214748364, or equal but the next digit is > 7 (or 8),
* the number is too big, and we will return a range error.
*
* Set any if any `digits' consumed; make it negative to indicate
* overflow.
*/
cutoff = neg ? -(unsigned long int) INT_LEAST64_MIN : INT_LEAST64_MAX;
cutlim = cutoff % (unsigned long int) base;
cutoff /= (unsigned long int) base;
for (acc = 0, any = 0;; c = *s++) {
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c -= 'A' - 10;
else if (c >= 'a' && c <= 'z')
c -= 'a' - 10;
else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else {
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0) {
acc = neg ? INT_LEAST64_MIN : INT_LEAST64_MAX;
} else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (char *) (any ? (char *) s - 1 : nptr);
return (acc);
}
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment