aboutsummaryrefslogtreecommitdiffstats
path: root/include/stdlib.h
blob: 3229384d7b4fd06baf500117616db66c6704cdc5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
/**
 * slibc — Yet another C library
 * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
 * 
 * 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef _STDLIB_H
#define _STDLIB_H
#include <slibc/version.h>
#include <slibc/features.h>


#include <malloc.h>



#define __NEED_size_t
#define __NEED_wchar_t
#define __NEED_div_t
#define __NEED_ldiv_t
#define __NEED_lldiv_t

#include <bits/types.h>


/**
 * `NULL`'s canonical header is <stddef.h>.
 */
#ifndef NULL
# define NULL  ((void*)0)
#endif


/**
 * The value a process shall exit with upon
 * success completion.
 * 
 * @since  Always.
 */
#define EXIT_SUCCESS  0

/**
 * A standard value a process can exit with
 * if it terminates because of failure.
 * 
 * @since  Always.
 */
#define EXIT_FAILURE  1



/**
 * Perform an integer division and return
 * both the quotient and the remainder.
 * 
 * @param   numerator    The numerator.
 * @param   denominator  The denominator, must not be 0 lest
 *                       the process will be killed by SIGFPE.
 * @return               The quotient in `.quot`, and
 *                       the remainder in `.rem`.
 * 
 * @since  Always.
 */
div_t div(int, int)
  __GCC_ONLY(__attribute__((__const__)));

/**
 * Perform an integer division and return
 * both the quotient and the remainder.
 * 
 * @param   numerator    The numerator.
 * @param   denominator  The denominator, must not be 0 lest
 *                       the process will be killed by SIGFPE.
 * @return               The quotient in `.quot`, and
 *                       the remainder in `.rem`.
 * 
 * @since  Always.
 */
ldiv_t ldiv(long, long)
  __GCC_ONLY(__attribute__((__const__)));

/**
 * Perform an integer division and return
 * both the quotient and the remainder.
 * 
 * @param   numerator    The numerator.
 * @param   denominator  The denominator, must not be 0 lest
 *                       the process will be killed by SIGFPE.
 * @return               The quotient in `.quot`, and
 *                       the remainder in `.rem`.
 * 
 * @since  Always.
 */
lldiv_t lldiv(long long, long long)
  __GCC_ONLY(__attribute__((__const__)));


/**
 * Return the absolute value of an integer.
 * 
 * Be aware, if the value is `INT_MIN` and
 * `-INT_MAX != -INT_MIN`, the result will
 * overflow, and `INT_MIN` will (probably)
 * be returned.
 * 
 * @param   value  The integer.
 * @return         The absolute value of the integer.
 * 
 * @since  Always.
 */
int (abs)(int)
  __GCC_ONLY(__attribute__((__const__)));
#define abs(value)  ((int)value < 0 ? -(int)value : (int)value)

/**
 * Return the absolute value of an integer.
 * 
 * Be aware, if the value is `LONG_MIN` and
 * `-LONG_MAX != -LONG_MIN`, the result will
 * overflow, and `LONG_MIN` will (probably)
 * be returned.
 * 
 * @param   value  The integer.
 * @return         The absolute value of the integer.
 * 
 * @since  Always.
 */
long int (labs)(long int)
  __GCC_ONLY(__attribute__((__const__)));
#define labs(value)  ((long int)value < 0 ? -(long int)value : (long int)value)

/**
 * Return the absolute value of an integer.
 * 
 * Be aware, if the value is `LLONG_MIN` and
 * `-LLONG_MAX != -LLONG_MIN`, the result will
 * overflow, and `LLONG_MIN` will (probably)
 * be returned.
 * 
 * @param   value  The integer.
 * @return         The absolute value of the integer.
 * 
 * @since  Always.
 */
long long int (llabs)(long long int)
  __GCC_ONLY(__attribute__((__const__)));
#define llabs(value)  ((long long int)value < 0 ? -(long long int)value : (long long int)value)


#if !defined(__PORTABLE)
/**
 * Get the absolute path of a file.
 * It will remove all redundant slashes, all "./":s,
 * and all "../":s, but not resolve symbolic links.
 * 
 * This is a slibc extension.
 * 
 * @param   file  The file.
 * @param   ref   The directory the file's specified path is
 *                relative, `NULL` for the current working directory.
 * @return        The file's absolute pathname. Will end with a slash
 *                if `file` does. (Or if `ref` does but file is empty.)
 * 
 * @throws  ENOMEM  The process cannot allocate more memory.
 * 
 * @since  Always.
 */
char* abspath(const char*, const char*)
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__(1), __malloc__)));

/**
 * Get the relative path of a file.
 * 
 * This is a slibc extension.
 * 
 * @param   file  The file.
 * @param   ref   The file the result shall be relative to,
 *                `NULL` for the current working directory.
 *                If and only if this path ends with a slash,
 *                (or if it is `NULL`,) it will be treated as
 *                a directory in which a symbolic link, with
 *                the result as it target, can be located to
 *                point to `file`.
 * 
 * @throws  ENOMEM  The process cannot allocate more memory.
 * 
 * @since  Always.
 */
char* relpath(const char*, const char*)
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__(1), __malloc__)));
#endif


/**
 * Convert a string to a floating-point value,
 * without checking for errors.
 * 
 * The string may being with an arbitrary number
 * of whitespace characters. Convertion will end
 * when a character is encountered that is not a
 * decimal digit, and is not an absolutely leading
 * '-' or '+', or the first '.'.
 * 
 * @param   string  The string to convert.
 * @return          The number encoded by the string.
 * 
 * @since  Always.
 */
double atof(const char*)
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__, __pure__)));

/**
 * Convert a string to an integer,
 * without checking for errors.
 * 
 * The string may being with an arbitrary number
 * of whitespace characters. Convertion will end
 * when a character is encountered that is not a
 * decimal digit, and is not an absolutely leading
 * '-' or '+'.
 * 
 * @param   string  The string to convert.
 * @return          The integer encoded by the string.
 * 
 * @since  Always.
 */
int atoi(const char*)
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__, __pure__)));

/**
 * Convert a string to an integer,
 * without checking for errors.
 * 
 * The string may being with an arbitrary number
 * of whitespace characters. Convertion will end
 * when a character is encountered that is not a
 * decimal digit, and is not an absolutely leading
 * '-' or '+'.
 * 
 * @param   string  The string to convert.
 * @return          The integer encoded by the string.
 * 
 * @since  Always.
 */
long int atol(const char*)
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__, __pure__)));

/**
 * Convert a string to an integer,
 * without checking for errors.
 * 
 * The string may being with an arbitrary number
 * of whitespace characters. Convertion will end
 * when a character is encountered that is not a
 * decimal digit, and is not an absolutely leading
 * '-' or '+'.
 * 
 * @param   string  The string to convert.
 * @return          The integer encoded by the string.
 * 
 * @since  Always.
 */
long long int atoll(const char*)
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__, __pure__)));

#if !defined(__PORTABLE)
/**
 * This function is identical to `atoll`.
 * 
 * This is a Linux libc extension.
 * 
 * @since  Always.
 */
long long int atoq(const char*)
  __deprecated("'atoq' is obsolete and not portable, use 'atoll' instead.")
  __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__, __pure__)));
#endif



/* TODO implement rand-functions */
#define RAND_MAX  1
int rand(void);
int rand_r(unsigned int* seed);
void srand(unsigned int seed);



/* TODO implement exit-functions */
__noreturn void abort(void);
__noreturn void _Exit(int);
int atexit(void (*)(void));
int on_exit(void (*)(int, void*), void*);
__noreturn void exit(int);
int at_quick_exit (void (*) (void));
__noreturn void quick_exit(int);



#endif