Hi,
Im doing a project where I make a CSV reader in plain old C. Ive got some great code snippets through helpful users on the internet, but after experimenting I have found I have been unable to join the snippets into a working program.
Basic code structure
Code:
#include <stdio.h>
int main(int argc, char ** argv){
int c;
FILE * fp;
if(argc < 2){
printf("Usage:\n\t%s filename\n",argv[0]);
return -1;
}
if((fp = fopen(argv[1],"rb")) == NULL){
printf("can't open %s\n",argv[1]);
return -2;
}
while((c = fgetc(fp)) != EOF){
/* TO DO- Put your code to parse the csv here char by char
*/
printf("%c",c);
}
fclose(fp);
return 0;
}
This is my code that stores my CSV file contents and stores them in the memory:
Code:
#define MAX_LINE_LEN 1024*512 /* 1/2 mega byte, should be more than sufficient */
.....
char line[MAX_LINE_LEN];
int len=0;
int cnt_of_fields=0;
char *p;
while( (c=GET_A_CHAR_FROM_FILE(fp))!=EOF){
switch(c)
{
case '"':
case '\'':
/* parse a quoted string, ignore it for now */
break;
case ',':
++cnt_of_fields; /* a comma signal end of previous field and begining of next fields */
line[len++]='\0';
if(len==MAX_LINE_LEN){
fprintf(stderr, "Line too long\n");
exit(-1);
}
break;
case '\n':
++cnt_of_fields; /* a EOL is end of record, and at the same time end of field */
line[len++]='\0';
/* make a copy of the line in the heap, note strdup or strcpy won't work in our case */
p = (char *)malloc(len);
memcpy(p, line, len); /* now all the fields in the record are stored in p[ ] */
add_a_record( p );
break;
default:
line[len++] = c;
if(len==MAX_LINE_LEN){
fprintf(stderr, "Line too long\n");
exit(-1);
}
}
}
This is my code that is designed to read the CSV data:
Code:
printf( "%s", line );