1: # include   <stdio.h>
   2: 
   3: /*
   4: **  FGETLINE -- get line from file
   5: **
   6: **	This routine reads a single newline-terminated line from
   7: **	a file.
   8: **
   9: **	Parameters:
  10: **		buf -- the buffer in which to place the result.
  11: **		maxch -- the maximum number of characters the
  12: **			buffer can hold.
  13: **		iop -- the file from which to read the characters.
  14: **
  15: **	Returns:
  16: **		NULL -- end-of-file or error.
  17: **		else -- 'buf'.
  18: **
  19: **	Side Effects:
  20: **		File activity on 'iop'.
  21: **
  22: **	Requires:
  23: **		getc -- to get the characters.
  24: **
  25: **	Called By:
  26: **		USER
  27: **
  28: **	Compilation Flags:
  29: **		none
  30: **
  31: **	Trace Flags:
  32: **		none
  33: **
  34: **	Diagnostics:
  35: **		none
  36: **
  37: **	Syserrs:
  38: **		none
  39: **
  40: **	History:
  41: **		8/2/78 (eric) -- written
  42: */
  43: 
  44: char *fgetline(buf, maxch, iop)
  45: char    *buf;
  46: int maxch;
  47: FILE    *iop;
  48: {
  49:     register char   *p;
  50:     register int    n;
  51:     register int    c;
  52: 
  53:     p = buf;
  54: 
  55:     for (n = maxch; n > 0; n--)
  56:     {
  57:         c = getc(iop);
  58: 
  59:         /* test for end-of-file or error */
  60:         if (c == EOF)
  61:         {
  62:             *p = 0;
  63:             return (NULL);
  64:         }
  65: 
  66:         /* test for newline */
  67:         if (c == '\n')
  68:             break;
  69: 
  70:         /* insert character into buffer */
  71:         *p++ = c;
  72:     }
  73: 
  74:     /* null-terminate the string */
  75:     *p = 0;
  76:     return (buf);
  77: }
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