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cutils.c
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Fri, Sep 22, 01:28

cutils.c
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/**
* @file cutils.c
*
* @brief Utilities C functions.
*
* @copyright
* Copyright (©) 2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* SPC (Swiss Plasma Center)
*
* futils is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* futils 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 Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* @authors
* (in alphabetical order)
* @author Stephan Brunner <stephan.brunner@epfl.ch>
* @author Ben McMillan <B.F.McMillan@warwick.ac.uk>
* @author Trach-Minh Tran <trach-minh.tran@epfl.ch>
*/
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
double mem_(void)
{
// Return current memory usage in MB (linux x86 ony!)
FILE *file;
char proc[256];
int mm, rss;
sprintf(proc,"/proc/%d/statm",(int)getpid());
if (!(file = fopen(proc,"r"))) {
return -1;
}
fscanf(file,"%d %d",&mm,&rss);
fclose(file);
return ((double)rss) * ((double)getpagesize() /1024.0/1024.0);
}
double mem(void)
{
// Return current memory usage in MB (linux x86 ony!)
return mem_();
}
/* #include <sys/resource.h> */
/* double mem_(void) */
/* { */
/* // Return current memory usage in MB */
/* struct rusage usage; */
/* double memkb; */
/* if (getrusage(RUSAGE_SELF, &usage) != 0) */
/* return -1; */
/* memkb = (double) usage.ru_maxrss; */
/* return ( memkb/1024.0 ); */
/* } */
double second_(void)
{
// Return elapsed wall time in s.
struct timeval tp;
struct timezone tzp;
int i;
i = gettimeofday(&tp,&tzp);
return ( (double) tp.tv_sec + (double) tp.tv_usec * 1.e-6 );
}
double second(void)
{
// Return elapsed wall time in s.
return second_();
}
double seconds_(void)
{
// Return elapsed wall time in s.
struct timeval tp;
struct timezone tzp;
int i;
i = gettimeofday(&tp,&tzp);
return ( (double) tp.tv_sec + (double) tp.tv_usec * 1.e-6 );
}
double seconds(void)
{
// Return elapsed wall time in s.
return seconds_();
}
int fsize_(const char *file, unsigned int l)
{
// Return size of file in bytes
struct stat buf;
stat( file, &buf);
return (int)buf.st_size;
}
int fsize(const char *file, unsigned int l)
{
// Return size of file in bytes
return fsize_(file, l);
}
void ftos_(const char *file, int *s, char *buf)
{
// Put the content of file to a string
int fd, n;
fd = open(file, O_RDONLY);
n = read(fd, buf, (size_t)*s);
close(fd);
}
void ftos(const char *file, int *s, char *buf)
{
// Put the content of file to a string
ftos_(file, s, buf);
}
void stof_(const char *file, int *s, char *buf)
{
// Write string to file
int fd, n;
fd = creat(file, 0644);
n = write(fd, buf, (size_t)*s);
close(fd);
}
void stof(const char *file, int *s, char *buf)
{
// Write string to file
stof_(file, s, buf);
}
void stostdout_(int *s, char *buf)
{
// Write string to stdout
int n;
n = write(1, buf, (size_t)*s);
}
void stostdout(int *s, char *buf)
{
// Write string to stdout
stostdout_(s, buf);
}
// Read in 1kb chunks in copy_file,
// also use as temporary for file names
#define CHSIZE 1024
void copy_file_(char *infile, int *lengthin, char *outfile, int *lengthout) {
// Copies a file from one location to another using fread, fwrite.
char buf[CHSIZE];
int err, count=CHSIZE;
memcpy(buf,infile,CHSIZE*sizeof(char));
buf[*lengthin <CHSIZE ? *lengthin : CHSIZE-1] = '\0';
FILE *in = fopen(buf, "rb");
if (in == NULL) {
printf("could not open infile\n");
return;
}
memcpy(buf,outfile,CHSIZE*sizeof(char));
buf[*lengthout<CHSIZE ? *lengthout : CHSIZE-1] = '\0';
FILE *out = fopen(buf,"wb");
if (out == NULL) {
fclose(in);
printf("could not open outfile\n");
return;
}
while (1) {
err = fread(buf,sizeof(char),count,in);
fwrite(buf,sizeof(char),err,out);
if (err!=count) break;
}
fclose(in);
fclose(out);
}
void copy_file(char *infile, int *lengthin, char *outfile, int *lengthout) {
// Copies a file from one location to another using fread, fwrite.
copy_file_(infile, lengthin, outfile, lengthout);
}
void move_file_(char *infile, int *lengthin, char *outfile, int *lengthout) {
// Moves a file from one location to another using copy_file_ and
// unlink (man 2 unlink)
char buf[CHSIZE];
copy_file_(infile, lengthin, outfile, lengthout);
memcpy(buf, infile,CHSIZE*sizeof(char));
buf[*lengthin <CHSIZE ? *lengthin : CHSIZE-1] = '\0';
if( unlink(buf) == -1 ){
fprintf(stderr, "%s: removing %s\n", strerror(errno), buf);
}
}
void move_file(char *infile, int *lengthin, char *outfile, int *lengthout) {
// Moves a file from one location to another using copy_file_ and
// unlink (man 2 unlink)
move_file_(infile, lengthin, outfile, lengthout);
}

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