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NetBSD 6.1.5 - man page for getline (netbsd section 3)

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GETDELIM(3)			   BSD Library Functions Manual 		      GETDELIM(3)

     getdelim, getline -- read a delimited record from a stream

     Standard C Library (libc, -lc)

     #include <stdio.h>

     getdelim(char ** restrict lineptr, size_t * restrict n, int delimiter,
	 FILE * restrict stream);

     getline(char ** restrict lineptr, size_t * restrict n, FILE * restrict stream);

     The getdelim() function reads from the stream until it encounters a character matching
     delimiter, storing the input in *lineptr.	The buffer is NUL-terminated and includes the
     delimiter.  The delimiter character must be representable as an unsigned char.

     If *n is non-zero, then *lineptr must be pre-allocated to at least *n bytes.  The buffer
     should be allocated dynamically; it must be possible to free(3) *lineptr.	getdelim()
     ensures that *lineptr is large enough to hold the input, updating *n to reflect the new

     The getline() function is equivalent to getdelim() with delimiter set to the newline charac-

     The getdelim() and getline() functions return the number of characters read, including the
     delimiter.  If no characters were read and the stream is at end-of-file, the functions
     return -1.  If an error occurs, the functions return -1 and the global variable errno is set
     to indicate the error.

     The functions do not distinguish between end-of-file and error, and callers must use feof(3)
     and ferror(3) to determine which occurred.

     The following code fragment reads lines from a file and writes them to standard output.

	   char *line = NULL;
	   size_t linesize = 0;
	   ssize_t linelen;

	   while ((linelen = getline(&line, &linesize, fp)) != -1)
		   fwrite(line, linelen, 1, stdout);

	   if (ferror(fp))

     [EINVAL]	  lineptr or n is a NULL pointer.

     [EOVERFLOW]  More than SSIZE_MAX characters were read without encountering the delimiter.

     The getdelim() and getline() functions may also fail and set errno for any of the errors
     specified in the routines fflush(3), malloc(3), read(2), stat(2), or realloc(3).

     ferror(3), fgets(3), fopen(3)

     The getdelim() and getline() functions conform to IEEE Std 1003.1-2008 (``POSIX.1'').

BSD					  June 30, 2010 				      BSD
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