#include <stdio.h>
#include <stdlib.h>
#include <string.h>
ssize_t mygetline(char **lineptr, size_t *n, FILE *stream)
{
if(*lineptr==NULL){
*n=50;
*lineptr=malloc(*n);
}
int ch;
int i=0;
while(1){
ch=fgetc(stream);
if(ch==EOF)
return -1;
if(i > *n){
*n+=50;
*lineptr=realloc(*lineptr,*n);
}
*(*lineptr+i)=ch;
i++;
if(ch=='\n'){
*(*lineptr+i)='\0';
return i;
}
}
return i;
}
void mygetline_free(char **lineptr)
{
if(*lineptr != NULL)
{
free(*linefree);
}
}
int main(int argc,char **argv)
{
FILE *fp;
char *line = NULL;
size_t line_size = 0;
if(argc < 2)
{
fprintf(stderr,"Usage...\n");
exit(1);
}
fp = fopen(argv[1],"r");
if(fp == NULL)
{
perror("fopen()");
exit(1);
}
while(1)
{
if(mygetline(&line,&line_size,fp) < 0)
break;
printf("line_size = %d\n",line_size);
printf("%d\n",strlen(line));
printf("%s\n",line);
}
fclose(fp);
mygetline_free(line);
exit(0);
}
