getline man page on FreeBSD

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GETLINE(3)		 BSD Library Functions Manual		    GETLINE(3)

     getdelim, getline — get a line from a stream

     Standard C Library (libc, -lc)

     #define _WITH_GETLINE
     #include <stdio.h>

     getdelim(char ** restrict linep, size_t * restrict linecapp,
	 int delimiter, FILE * restrict stream);

     getline(char ** restrict linep, size_t * restrict linecapp,
	 FILE * restrict stream);

     The getdelim() function reads a line from stream, delimited by the char‐
     acter delimiter.  The getline() function is equivalent to getdelim() with
     the newline character as the delimiter.  The delimiter character is
     included as part of the line, unless the end of the file is reached.  The
     caller may provide a pointer to a malloc buffer for the line in *linep,
     and the capacity of that buffer in *linecapp; if *linecapp is 0, then
     *linep is treated as NULL.	 These functions may expand the buffer as
     needed, as if via realloc(), and update *linep and *linecapp accordingly.

     The getdelim() and getline() functions return the number of characters
     written, excluding the terminating NUL character.	The value -1 is
     returned if an error occurs, or if end-of-file is reached.

     The following code fragment reads lines from a file and writes them to
     standard output.  The fwrite() function is used in case the line contains
     embedded NUL characters.

	   char *line = NULL;
	   size_t linecap = 0;
	   ssize_t linelen;
	   while ((linelen = getline(&line, &linecap, fp)) > 0)
		   fwrite(line, linelen, 1, stdout);

     Many application writers used the name getline before the getline() func‐
     tion was introduced in IEEE Std 1003.1 (“POSIX.1”), so a prototype is not
     provided by default in order to avoid compatibility problems.  Applica‐
     tions that wish to use the getline() function described herein should
     either request a strict IEEE Std 1003.1-2008 (“POSIX.1”) environment by
     defining the macro _POSIX_C_SOURCE to the value 200809 or greater, or by
     defining the macro _WITH_GETLINE, prior to the inclusion of <stdio.h>.
     For compatibility with GNU libc, defining either _BSD_SOURCE or
     _GNU_SOURCE prior to the inclusion of <stdio.h> will also make getline()

     These functions may fail if:

     [EINVAL]		Either linep or linecapp is NULL.

     [EOVERFLOW]	No delimiter was found in the first SSIZE_MAX charac‐

     These functions may also fail for any of the errors specified for fgets()
     and malloc().

     fgetln(3), fgets(3), malloc(3)

     The getdelim() and getline() functions conform to IEEE Std 1003.1-2008

     These routines first appeared in FreeBSD 8.0.

     There are no wide character versions of getdelim() or getline().

BSD				March 29, 2009				   BSD

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