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fgets.0
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FGETS(3) UNIX Programmer's Manual FGETS(3)
NNAAMMEE
ffggeettss, ggeettss - get a line from a stream
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssttddiioo..hh>>
_c_h_a_r _*
ffggeettss(_c_h_a_r _*_s_t_r, _s_i_z_e___t _s_i_z_e, _F_I_L_E _*_s_t_r_e_a_m)
_c_h_a_r _*
ggeettss(_c_h_a_r _*_s_t_r)
DDEESSCCRRIIPPTTIIOONN
The ffggeettss() function reads at most one less than the number of characters
specified by size from the given _s_t_r_e_a_m and stores them in the string
_s_t_r. Reading stops when a newline character is found, at end¡of¡file or
error. The newline, if any, is retained. In any case a `\0' character
is appended to end the string.
The ggeettss() function is equivalent to ffggeettss() with an infinite size and a
_s_t_r_e_a_m of _s_t_d_i_n, except that the newline character (if any) is not stored
in the string. It is the caller's responsibility to ensure that the in¡
put line, if any, is sufficiently short to fit in the string.
RREETTUURRNN VVAALLUUEESS
Upon successful completion, ffggeettss() and ggeettss() return a pointer to the
string. If end¡of¡file or an error occurs before any characters are
read, they return NULL. The ffggeettss() and functions ggeettss() do not distin¡
guish between end¡of¡file and error, and callers must use feof(3) and
ferror(3) to determine which occurred.
EERRRROORRSS
[EBADF] The given _s_t_r_e_a_m is not a readable stream.
The function ffggeettss() may also fail and set _e_r_r_n_o for any of the errors
specified for the routines fflush(3), fstat(2), read(2), or malloc(3).
The function ggeettss() may also fail and set _e_r_r_n_o for any of the errors
specified for the routine getchar(3).
SSEEEE AALLSSOO
feof(3), ferror(3), fgetline(3)
SSTTAANNDDAARRDDSS
The functions ffggeettss() and ggeettss() conform to ANSI C3.159¡1989 (``ANSI
C'').
BBUUGGSS
Since it is usually impossible to ensure that the next input line is less
than some arbitrary length, and because overflowing the input buffer is
almost invariably a security violation, programs should _N_E_V_E_R use ggeettss().
The ggeettss() function exists purely to conform to ANSI C3.159¡1989 (``ANSI
C'').
BSD Experimental June 29, 1991 1