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fastio.c
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fastio.c
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#include <stdio.h> // handling I/O
#include <stdlib.h> // exit(-1), size_t
#include <fcntl.h> // file control --fd
#include <sys/stat.h> // file descriptor --fd
#include <unistd.h> // POSIX interface for S_IRUSR
#include <sys/mman.h> // mmap
#include <errno.h> // error number explained
#include <string.h> // strcpy(); strerror();
#define N 2 // number of files
/******************** PROTOTYPE ********************/
void *getArg(int argc, char *argv[]);
void *fastOpen(int i);
void *fastPrint(int i);
void *fastClose(int i);
/******************** GLOBAL ********************/
// MY FILE STRUCT //
struct File
{
char *name;//[256];
char *delim;//[2];
char *pMem;
int fd;
int size;
} fs[N];
// FILE DESCRIPTIOR STRUCT //
struct stat st;
/******************** MAIN ********************/
int main(int argc, char *argv[])
{
// ARGUMENTS //
getArg(argc, argv);
// ALLOCATION FUNCTIONS //
for (int i=0; i<N; i++)
{
fastOpen(i);
fastPrint(i);
fastClose(i);
}
// END //
printf("\n");
return 0;
}
/******************** FUNCTIONS ********************/
//////////////////// GET ARG ////////////////////
void *getArg(int argc, char *argv[])
{
int f = 0;
int d = 0;
for (int i=0; i<argc; i++)
{
// IDENTIFY FLAG //
if (argv[i][0] == '-')
{
// GET FLAG //
switch(argv[i][1])
{
// CASE SPECIFIC ACTION //
case 'f':
{
// FILE FLAG //
fs[f].name = argv[i+1];
stat(argv[i+1], &st);
fs[f].size = st.st_size;
f++;
break;
}
case 'd':
{
// DELIMITER FLAG //
fs[d].delim = argv[i+1];
d++;
break;
}
}
}
}
}
//////////////////// FAST OPEN ////////////////////
void *fastOpen(int i)
{
// OPEN //
fs[i].fd = open(fs[i].name, O_RDWR, S_IRUSR | S_IWUSR);
// ERROR //
if (fstat(fs[i].fd, &st) == -1)
{
fprintf(stderr, "\n[ERR %i] %s", errno, strerror(errno));
exit(-1);
}
// DYNAMICALLY ALLOCATE //
fs[i].pMem = mmap
(
NULL
, fs[i].size
, PROT_READ | PROT_WRITE
, MAP_SHARED
, fs[i].fd
, 0
);
}
//////////////////// FAST PRINT ////////////////////
void *fastPrint(int i)
{
// PRINT FILE //
printf("\nPrint %s\n", fs[i].name);
for (int j=0; j<fs[i].size; j++)
{
printf("%c", fs[i].pMem[j]);
}
}
//////////////////// FAST CLOSE ////////////////////
void *fastClose(int i)
{
// DEALLOCATE & CLOSE //
munmap(fs[i].pMem, fs[i].size);
close(fs[i].fd);
}