Thread: best way to read a string

ok before you jump to give me a link to the faq's, check this out...

Reading a string from a file, have to stop when i get to a certain delimiter, can contain white space in string. What I have is this....

Code:

 
 	int ch;
   	int index = 0;
   
   	while (( ch = fgetc( fp )) != delimeter && ch != '\n' && ch != EOF ) {
   		*(buffer + index) = (char)ch;
   
   		index++;
   		if ( index == max_buffer ) {
   			break;
   		}
   	}

What i want is to do it with fscanf but i cant work out how to get it to keep reading past the whitespace and stop at the delimiter.

Code:

????  fscanf( fp, "%s,", string );  //doesnt skip white space

Any help would be great.



Edit: fixed up code sample

Have you looked into the %[ specifier?

Code:

/* file.txt
line.1 line_2 line~3
*/

#include <stdio.h>

void foo(const char *filename, int delimiter)
{
   FILE *file = fopen(filename, "r");
   if ( file )
   {
      char format[10], result[32];
      sprintf(format, "%%%d[^%c]", (int)(sizeof result - 1), delimiter);
      printf("format = \"%s\"\n", format);
      if ( fscanf(file, format, result) == 1 )
      {
         printf("result>>\n%s\n<<\n", result);
      }
   }
   else
   {
      perror(filename);
   }
}

int main (void)
{
   foo("file.txt", '_');
   return 0;
}

/* my output
format = "%31[^_]"
result>>
line.1 line
<<
*/

will do, thankyou

okay baffled! Based on the man page i figured this should work...

Code:

 #define MAX_TK1 10
 void test_scanf( void )
 {
     int i;
     char format[BUFSIZ];
     char buffer[] = "s3328,24";
     char token1[MAX_TK1];
     int token2;
 
 
     sprintf( format, "%%%d[^,]s%%*c%%d", MAX_TK1 - 1 );
     printf( "format: `%s'", format );
 
     sscanf( buffer, format, token1, &token2 );
 
     printf( "test: %s %d\n", token1, token2 );
 
     return;
 }

but it only copies the first token but not the second. I just cant figure out the correct syntax!

Code:

sprintf( format, "%%%d[^,]s%%*c%%d", MAX_TK1 - 1 );

Remove the s.