1 //===========================================================================
5 // ISO C standard I/O gets() function
7 //===========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
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27 // or inline functions from this file, or you compile this file and link it
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38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //===========================================================================
41 //#####DESCRIPTIONBEGIN####
43 // Author(s): jlarmour
46 // Purpose: Implementation of ISO C standard I/O gets() function
50 //####DESCRIPTIONEND####
52 //===========================================================================
56 #include <pkgconf/libc_stdio.h> // Configuration header
60 #include <cyg/infra/cyg_type.h> // Common type definitions
61 #include <cyg/infra/cyg_ass.h> // Assertion support
62 #include <cyg/infra/cyg_trac.h> // Tracing support
63 #include <stddef.h> // NULL and size_t from compiler
64 #include <stdio.h> // header for this file
65 #include <errno.h> // error codes
66 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
70 // FIXME: should be reworked to read buffer at a time, and scan that
71 // for newlines, rather than reading byte at a time.
74 gets( char *s ) __THROW
76 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stdin;
79 cyg_uint8 *str=(cyg_uint8 *)s;
82 CYG_CHECK_DATA_PTRC( s );
83 CYG_CHECK_DATA_PTRC( real_stream );
85 CYG_REPORT_FUNCTYPE( "returning string %08x");
86 CYG_REPORT_FUNCARG1( "s=%08x", s );
89 err = real_stream->read_byte( &c );
91 // if nothing to read, try again ONCE after refilling buffer
93 err = real_stream->refill_read_buffer();
95 err = real_stream->read_byte( &c );
98 if (1 == nch) { // indicates EOF at start
99 CYG_REPORT_RETVAL( NULL );
106 if ('\n' == c) // discard newlines
111 *str = '\0'; // NULL terminate it
113 if (err && EAGAIN != err) {
114 real_stream->set_error( err );
116 CYG_REPORT_RETVAL( NULL );
120 CYG_REPORT_RETVAL( s );