kopia lustrzana https://gitlab.com/sane-project/backends
176 wiersze
4.7 KiB
C
176 wiersze
4.7 KiB
C
/** @file sanei_backend.h
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* Compatibility header file for backends
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*
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* This file provides some defines for macros missing on some platforms.
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* It also has the SANE API entry points. sanei_backend.h must be included
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* by every backend.
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*
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* @sa sanei.h sanei_thread.h
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*/
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/** @name Compatibility macros
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* @{
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*/
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#include <sane/sanei_debug.h>
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#if __STDC_VERSION__ >= 199901L
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/* __func__ is provided */
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#elif __GNUC__ >= 5
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/* __func__ is provided */
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#elif __GNUC__ >= 2
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# define __func__ __FUNCTION__
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#else
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# define __func__ "(unknown)"
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#endif
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#ifndef HAVE_OS2_H
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#include <fcntl.h>
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#ifndef O_NONBLOCK
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# ifdef O_NDELAY
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# define O_NONBLOCK O_NDELAY
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# else
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# ifdef FNDELAY
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# define O_NONBLOCK FNDELAY /* last resort */
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# endif
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# endif
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#endif
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#endif /* HAVE_OS2_H */
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#include <limits.h>
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#ifndef PATH_MAX
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# define PATH_MAX 1024
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#endif
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#ifndef MM_PER_INCH
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#define MM_PER_INCH 25.4
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#endif
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#ifdef HAVE_SIGPROCMASK
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# define SIGACTION sigaction
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#else
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/* Just enough backwards compatibility that we get by in the backends
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without making handstands. */
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# ifdef sigset_t
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# undef sigset_t
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# endif
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# ifdef sigemptyset
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# undef sigemptyset
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# endif
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# ifdef sigfillset
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# undef sigfillset
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# endif
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# ifdef sigaddset
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# undef sigaddset
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# endif
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# ifdef sigdelset
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# undef sigdelset
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# endif
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# ifdef sigprocmask
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# undef sigprocmask
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# endif
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# ifdef SIG_BLOCK
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# undef SIG_BLOCK
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# endif
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# ifdef SIG_UNBLOCK
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# undef SIG_UNBLOCK
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# endif
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# ifdef SIG_SETMASK
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# undef SIG_SETMASK
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# endif
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# define sigset_t int
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# define sigemptyset(set) do { *(set) = 0; } while (0)
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# define sigfillset(set) do { *(set) = ~0; } while (0)
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# define sigaddset(set,signal) do { *(set) |= sigmask (signal); } while (0)
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# define sigdelset(set,signal) do { *(set) &= ~sigmask (signal); } while (0)
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# define sigaction(sig,new,old) sigvec (sig,new,old)
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/* Note: it's not safe to just declare our own "struct sigaction" since
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some systems (e.g., some versions of OpenStep) declare that structure,
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but do not implement sigprocmask(). Hard to believe, aint it? */
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# define SIGACTION sigvec
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# define SIG_BLOCK 1
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# define SIG_UNBLOCK 2
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# define SIG_SETMASK 3
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#endif /* !HAVE_SIGPROCMASK */
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/* @} */
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/** @name Declaration of entry points:
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern SANE_Status ENTRY(init) (SANE_Int *, SANE_Auth_Callback);
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extern SANE_Status ENTRY(get_devices) (const SANE_Device ***, SANE_Bool);
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extern SANE_Status ENTRY(open) (SANE_String_Const, SANE_Handle *);
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extern const SANE_Option_Descriptor *
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ENTRY(get_option_descriptor) (SANE_Handle, SANE_Int);
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extern SANE_Status ENTRY(control_option) (SANE_Handle, SANE_Int, SANE_Action,
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void *, SANE_Word *);
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extern SANE_Status ENTRY(get_parameters) (SANE_Handle, SANE_Parameters *);
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extern SANE_Status ENTRY(start) (SANE_Handle);
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extern SANE_Status ENTRY(read) (SANE_Handle, SANE_Byte *, SANE_Int,
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SANE_Int *);
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extern SANE_Status ENTRY(set_io_mode) (SANE_Handle, SANE_Bool);
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extern SANE_Status ENTRY(get_select_fd) (SANE_Handle, SANE_Int *);
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extern void ENTRY(cancel) (SANE_Handle);
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extern void ENTRY(close) (SANE_Handle);
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extern void ENTRY(exit) (void);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#ifndef STUBS
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/* Now redirect sane_* calls to backend's functions: */
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#define sane_init(a,b) ENTRY(init) (a,b)
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#define sane_get_devices(a,b) ENTRY(get_devices) (a,b)
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#define sane_open(a,b) ENTRY(open) (a,b)
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#define sane_get_option_descriptor(a,b) ENTRY(get_option_descriptor) (a,b)
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#define sane_control_option(a,b,c,d,e) ENTRY(control_option) (a,b,c,d,e)
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#define sane_get_parameters(a,b) ENTRY(get_parameters) (a,b)
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#define sane_start(a) ENTRY(start) (a)
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#define sane_read(a,b,c,d) ENTRY(read) (a,b,c,d)
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#define sane_set_io_mode(a,b) ENTRY(set_io_mode) (a,b)
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#define sane_get_select_fd(a,b) ENTRY(get_select_fd) (a,b)
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#define sane_cancel(a) ENTRY(cancel) (a)
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#define sane_close(a) ENTRY(close) (a)
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#define sane_exit(a) ENTRY(exit) (a)
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#endif /* STUBS */
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/* @} */
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/** Internationalization for SANE backends
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*
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* Add SANE_I18N() to all texts that can be translated.
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* E.g. out_txt = SANE_I18N("Hello");
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*/
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#ifndef SANE_I18N
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#define SANE_I18N(text) text
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#endif
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/** Option_Value union
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*
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* Convenience union to access option values given to the backend
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*/
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#ifndef SANE_OPTION
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typedef union
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{
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SANE_Bool b; /**< bool */
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SANE_Word w; /**< word */
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SANE_Word *wa; /**< word array */
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SANE_String s; /**< string */
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}
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Option_Value;
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#define SANE_OPTION 1
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#endif
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