Making a string from a text file after a specific text

**GypsyV3nom** · 06-21-2016

I'm trying to create a string from a text file that pulls the characters after a specific sequence of characters to use as an output. Specifically, all the important characters in this text are proceeded by <1>, and end with an endline.
I currently am using fscanf, but it doesn't appear to be working:

fscanf(calibrate, "*[<1>] %s", enz);

where calibrate is the file I'm reading from (already opened), and enz is the array I want filled. Any advice would be appreciated. I already have a while loop in place to make sure I'm not at the end of the file.

**whiteflags** · 06-21-2016

fscanf() is really for computer generated files that have a specific formatted input. If you are searching for <1> in the middle of a line it will probably just get stuck.

Code:

while ( fgets( line, sizeof line, calibrate ) != NULL ) {
   char *ord = strstr( line, "<1>" );
   if ( ord != NULL ) {
      erz[0] = '\0';
      strncat( erz, ord, sizeof(erz) - 1);
      break;
   }
}

This is a bit more thorough search that will correctly find content such as

Lorem ipsum <1> dolor sit amet\n

as long as attention is paid to things like line length and the size of erz.

**GypsyV3nom** · 06-22-2016

I see how this could work, but it isn't helpful in this context since the important text is right after the <1> flag. Since "calibrate" is a text file, fscanf ends up working fine in the format:

fscanf(calibrate, "%s", enz);

but has the useless <1> text at the start of the output, which needs to be missing in the final program.

**whiteflags** · 06-22-2016

I guess you want to start copying at ord + 3 (i.e. the length of "<1>") then. Finding the token is the important thing.

**Salem** · 06-22-2016

You're making it way too complicated.

Code:

#include <stdio.h>

int main()
{
  char test[] = "<1>hello";
  char result[10];
  int n = sscanf(test,"<1>%s",result);
  printf("n=%d, result=%s\n",n,result);
  return 0;
}


$ gcc -Wall bar.c
$ ./a.out 
n=1, result=hello

Aside from the % character, every character stands for itself in a format string.

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