Cytoplasm/src/Util.c
Jordan Bancino 662696ce12
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C99 Compliance (#29)
This pull request brings Cytoplasm up from C89 to C99, which makes it much more portable across platforms. In particular, this pull request solves a number of issues with 32-bit platforms.

Closes #28.
Closes #12.
Closes #20.

Reviewed-on: #29
2024-01-13 17:13:45 -05:00

306 lines
5.9 KiB
C

/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Util.h>
#include <Memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <limits.h>
#include <pthread.h>
#ifndef PATH_MAX
#define PATH_MAX 256
#endif
#ifndef SSIZE_MAX
#define SSIZE_MAX LONG_MAX
#endif
uint64_t
UtilTsMillis(void)
{
struct timeval tv;
uint64_t ts;
uint64_t sec;
uint64_t usec;
gettimeofday(&tv, NULL);
/*
* POSIX defines struct timeval to be:
*
* struct timeval {
* time_t tv_sec;
* suseconds_t tv_usec;
* };
*
* Note: Although the C standard does not require that
* time_t be an integer type (it may be floating point),
* according to POSIX, time_t shall be an integer type.
* As we are targeting POSIX, not ANSI/ISO C, we can
* rely on this.
*
* The same goes for suseconds_t.
*/
// Two separate steps because time_t might be 32-bit. In that
// case, we want the multiplication to happen after the promotion
// to uint64_t.
sec = tv.tv_sec;
sec *= 1000;
usec = tv.tv_usec / 1000;
ts = sec + usec;
return ts;
}
uint64_t
UtilLastModified(char *path)
{
struct stat st;
uint64_t ts = 0;
if (stat(path, &st) == 0)
{
ts = st.st_mtim.tv_sec;
ts *= 1000;
ts += st.st_mtim.tv_nsec / 1000000;
}
return ts;
}
int
UtilMkdir(const char *dir, const mode_t mode)
{
char tmp[PATH_MAX];
char *p = NULL;
struct stat st;
size_t len;
len = strnlen(dir, PATH_MAX);
if (!len || len == PATH_MAX)
{
errno = ENAMETOOLONG;
return -1;
}
memcpy(tmp, dir, len);
tmp[len] = '\0';
if (tmp[len - 1] == '/')
{
tmp[len - 1] = '\0';
}
if (stat(tmp, &st) == 0 && S_ISDIR(st.st_mode))
{
return 0;
}
for (p = tmp + 1; *p; p++)
{
if (*p == '/')
{
*p = 0;
if (stat(tmp, &st) != 0)
{
if (mkdir(tmp, mode) < 0)
{
/* errno already set by mkdir() */
return -1;
}
}
else if (!S_ISDIR(st.st_mode))
{
errno = ENOTDIR;
return -1;
}
*p = '/';
}
}
if (stat(tmp, &st) != 0)
{
if (mkdir(tmp, mode) < 0)
{
/* errno already set by mkdir() */
return -1;
}
}
else if (!S_ISDIR(st.st_mode))
{
errno = ENOTDIR;
return -1;
}
return 0;
}
int
UtilSleepMillis(uint64_t ms)
{
struct timespec ts;
int res;
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000000;
res = nanosleep(&ts, &ts);
return res;
}
ssize_t
UtilGetDelim(char **linePtr, size_t * n, int delim, Stream * stream)
{
char *curPos, *newLinePtr;
size_t newLinePtrLen;
int c;
if (!linePtr || !n || !stream)
{
errno = EINVAL;
return -1;
}
if (*linePtr == NULL)
{
*n = 128;
if (!(*linePtr = Malloc(*n)))
{
errno = ENOMEM;
return -1;
}
}
curPos = *linePtr;
while (1)
{
c = StreamGetc(stream);
if (StreamError(stream) || (c == EOF && curPos == *linePtr))
{
return -1;
}
if (c == EOF)
{
break;
}
if ((*linePtr + *n - curPos) < 2)
{
if (SSIZE_MAX / 2 < *n)
{
#ifdef EOVERFLOW
errno = EOVERFLOW;
#else
errno = ERANGE;
#endif
return -1;
}
newLinePtrLen = *n * 2;
if (!(newLinePtr = Realloc(*linePtr, newLinePtrLen)))
{
errno = ENOMEM;
return -1;
}
curPos = newLinePtr + (curPos - *linePtr);
*linePtr = newLinePtr;
*n = newLinePtrLen;
}
*curPos++ = (char) c;
if (c == delim)
{
break;
}
}
*curPos = '\0';
return (ssize_t) (curPos - *linePtr);
}
ssize_t
UtilGetLine(char **linePtr, size_t * n, Stream * stream)
{
return UtilGetDelim(linePtr, n, '\n', stream);
}
static void
ThreadNoDestructor(void *p)
{
free(p);
}
uint32_t
UtilThreadNo(void)
{
static pthread_key_t key;
static int createdKey = 0;
static unsigned long count = 0;
uint32_t *no;
if (!createdKey)
{
pthread_key_create(&key, ThreadNoDestructor);
createdKey = 1;
}
no = pthread_getspecific(key);
if (!no)
{
no = malloc(sizeof(uint32_t));
*no = count++;
pthread_setspecific(key, no);
}
return *no;
}