mirror of
https://github.com/fish-shell/fish-shell
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147 lines
4.6 KiB
C++
147 lines
4.6 KiB
C++
#ifndef FISH_FALLBACK_H
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#define FISH_FALLBACK_H
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#include <stdint.h>
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#include "config.h"
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// The following include must be kept despite what IWYU says. That's because of the interaction
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// between the weak linking of `wcscasecmp` via `#define`s below and the declarations
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// in <wchar.h>. At least on OS X if we don't do this we get compilation errors do to the macro
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// substitution if wchar.h is included after this header.
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#include <cwchar> // IWYU pragma: keep
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//
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// Width of ambiguous characters. 1 is typical default.
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extern int32_t FISH_AMBIGUOUS_WIDTH;
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// Width of emoji characters.
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// 1 is the typical emoji width in Unicode 8.
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extern int32_t FISH_EMOJI_WIDTH;
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/// fish's internal versions of wcwidth and wcswidth, which can use an internal implementation if
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/// the system one is busted.
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int fish_wcwidth(wchar_t wc);
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int fish_wcswidth(const wchar_t *str, size_t n);
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// Replacement for mkostemp(str, O_CLOEXEC)
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// This uses mkostemp if available,
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// otherwise it uses mkstemp followed by fcntl
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int fish_mkstemp_cloexec(char *);
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/// thread_local support.
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#if HAVE_CX11_THREAD_LOCAL
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#define FISH_THREAD_LOCAL thread_local
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#elif defined(__GNUC__)
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#define FISH_THREAD_LOCAL __thread
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#elif defined(_MSC_VER)
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#define FISH_THREAD_LOCAL __declspec(thread)
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#else // !C++11 && !__GNUC__ && !_MSC_VER
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#error "No known thread local storage qualifier for this platform"
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#endif
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#ifndef WCHAR_MAX
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/// This _should_ be defined by wchar.h, but e.g. OpenBSD doesn't.
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#define WCHAR_MAX INT_MAX
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#endif
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/// Both ncurses and NetBSD curses expect an int (*func)(int) as the last parameter for tputs.
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/// Apparently OpenIndiana's curses still uses int (*func)(char) here.
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#if TPUTS_USES_INT_ARG
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using tputs_arg_t = int;
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#else
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using tputs_arg_t = char;
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#endif
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#ifndef HAVE_WINSIZE
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/// Structure used to get the size of a terminal window.
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struct winsize {
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/// Number of rows.
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unsigned short ws_row;
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/// Number of columns.
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unsigned short ws_col;
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};
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#endif
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#if defined(TPARM_SOLARIS_KLUDGE)
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/// Solaris tparm has a set fixed of parameters in its curses implementation, work around this here.
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#define fish_tparm tparm_solaris_kludge
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char *tparm_solaris_kludge(char *str, long p1 = 0, long p2 = 0, long p3 = 0, long p4 = 0,
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long p5 = 0, long p6 = 0, long p7 = 0, long p8 = 0, long p9 = 0);
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#else
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#define fish_tparm tparm
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#endif
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/// These functions are missing from Solaris 10, and only accessible from
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/// Solaris 11 in the std:: namespace.
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#ifndef HAVE_WCSCASECMP
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#ifdef HAVE_STD__WCSCASECMP
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using std::wcscasecmp;
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#else
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int wcscasecmp(const wchar_t *a, const wchar_t *b);
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#endif // HAVE_STD__WCSCASECMP
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#endif // HAVE_WCSCASECMP
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#ifndef HAVE_WCSNCASECMP
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#ifdef HAVE_STD__WCSNCASECMP
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using std::wcsncasecmp;
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#else
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int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);
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#endif // HAVE_STD__WCSNCASECMP
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#endif // HAVE_WCSNCASECMP
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#ifndef HAVE_DIRFD
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#ifndef __XOPEN_OR_POSIX
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#define dirfd(d) (d->dd_fd)
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#else
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#define dirfd(d) (d->d_fd)
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#endif
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#endif
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// autoconf may fail to detect gettext (645), so don't define a function call gettext or we'll get
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// build errors.
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/// Cover for gettext().
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char *fish_gettext(const char *msgid);
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/// Cover for bindtextdomain().
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char *fish_bindtextdomain(const char *domainname, const char *dirname);
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/// Cover for textdomain().
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char *fish_textdomain(const char *domainname);
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#ifndef HAVE_KILLPG
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/// Send specified signal to specified process group.
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int killpg(int pgr, int sig);
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#endif
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#ifndef HAVE_FLOCK
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/// Fallback implementation of flock in terms of fcntl.
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/// Danger! The semantics of flock and fcntl locking are very different.
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/// Use with caution.
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int flock(int fd, int op);
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#define LOCK_SH 1 // Shared lock.
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#define LOCK_EX 2 // Exclusive lock.
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#define LOCK_UN 8 // Unlock.
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#define LOCK_NB 4 // Don't block when locking.
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#endif
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// NetBSD _has_ wcstod_l, but it's doing some weak linking hullabaloo that I don't get.
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// Since it doesn't have uselocale (yes, the standard function isn't there, the non-standard
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// extension is), we can't try to use the fallback.
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#if !defined(HAVE_WCSTOD_L) && !defined(__NetBSD__)
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// On some platforms if this is incorrectly detected and a system-defined
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// defined version of `wcstod_l` exists, calling `wcstod` from our own
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// `wcstod_l` can call back into `wcstod_l` causing infinite recursion.
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// e.g. FreeBSD defines `wcstod(x, y)` as `wcstod_l(x, y, __get_locale())`.
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// Solution: namespace our implementation to make sure there is no symbol
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// duplication.
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#undef wcstod_l
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namespace fish_compat {
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double wcstod_l(const wchar_t *enptr, wchar_t **endptr, locale_t loc);
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}
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#define wcstod_l(x, y, z) fish_compat::wcstod_l(x, y, z)
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#endif
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#endif // FISH_FALLBACK_H
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