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notcurses_output(3) notcurses_output(3) NAME notcurses_output - output to ncplanes SYNOPSIS #include <notcurses/notcurses.h> static inline int ncplane_putc(struct ncplane* n, const nccell* c); int ncplane_putc_yx(struct ncplane* n, int y, int x, const nccell* c); static inline int ncplane_putchar(struct ncplane* n, char c); static inline int ncplane_putchar_yx(struct ncplane* n, int y, int x, char c); int ncplane_putchar_stained(struct ncplane* n, char c); static inline int ncplane_putwc(struct ncplane* n, wchar_t w); int ncplane_putwc_yx(struct ncplane* n, int y, int x, wchar_t w); static inline int ncplane_putwc_stained(struct ncplane* n, wchar_t w); static inline int ncplane_putegc(struct ncplane* n, const char* gclust, int* sbytes); int ncplane_putegc_yx(struct ncplane* n, int y, int x, const char* gclust, int* sbytes); int ncplane_putegc_stained(struct ncplane* n, const char* gclust, int* sbytes); static inline int ncplane_putwegc(struct ncplane* n, const wchar_t* gclust, int* sbytes); static inline int ncplane_putwegc_yx(struct ncplane* n, int y, int x, const wchar_t* gclust, int* sbytes); int ncplane_putwegc_stained(struct ncplane* n, const wchar_t* gclust, int* sbytes); int ncplane_putstr_yx(struct ncplane* n, int y, int x, const char* gclustarr); static inline int ncplane_putstr(struct ncplane* n, const char* gclus- tarr); int ncplane_putstr_aligned(struct ncplane* n, int y, ncalign_e align, const char* s); int ncplane_putstr_stained(struct ncplane* n, const char* s); static inline int ncplane_putwstr(struct ncplane* n, const wchar_t* gclustarr); int ncplane_putwstr_yx(struct ncplane* n, int y, int x, const wchar_t* gclustarr); static inline int ncplane_putwstr_aligned(struct ncplane* n, int y, ncalign_e align, const wchar_t* gclustarr); int ncplane_putwstr_stained(struct ncplane* n, const wchar_t* gclus- tarr); static inline int ncplane_putnstr(struct ncplane* n, size_t s, const char* gclustarr); int ncplane_putnstr_yx(struct ncplane* n, int y, int x, size_t s, const char* gclusters); int ncplane_putnstr_aligned(struct ncplane* n, int y, ncalign_e align, size_t s, const char* s); int ncplane_vprintf_aligned(struct ncplane* n, int y, ncalign_e align, const char* format, va_list ap); int ncplane_vprintf_yx(struct ncplane* n, int y, int x, const char* format, va_list ap); static inline int ncplane_vprintf(struct ncplane* n, const char* for- mat, va_list ap); static inline int ncplane_printf(struct ncplane* n, const char* format, ...); static inline int ncplane_printf_yx(struct ncplane* n, int y, int x, const char* format, ...); static inline int ncplane_printf_aligned(struct ncplane* n, int y, ncalign_e align, const char* format, ...); int ncplane_cursor_move_yx(struct ncplane* n, int y, int x); int ncplane_puttext(struct ncplane* n, int y, ncalign_e align, const char* text, size_t* bytes); DESCRIPTION These functions write EGCs (Extended Grapheme Clusters) to the speci- fied struct ncplanes. The following inputs are supported: • ncplane_putc(): writes a single nccell (see notcurses_cell(3)) • ncplane_putchar(): writes a single 7-bit ASCII character • ncplane_putwc(): writes a single wchar_t (following UTF-8 conversion) • ncplane_putwegc(): writes a single EGC from an array of wchar_t • ncplane_putegc(): writes a single EGC from an array of UTF-8 • ncplane_putstr(): writes a set of EGCs from an array of UTF-8 • ncplane_putwstr(): writes a set of EGCs from an array of wchar_t • ncplane_vprintf(): formatted output using va_list • ncplane_printf(): formatted output using variadic arguments • ncplane_puttext(): multi-line, line-broken, aligned text All of these use the ncplane's active styling, save notcurses_putc(), which uses the nccell's styling. Functions accepting a single EGC ex- pect a series of wchar_t terminated by L'\0' or a series of UTF-8 char terminated by '\0'. The EGC must be well-formed, and must not contain any cluster breaks. For more information, consult Unicode(R) Standard Annex #29 (https://unicode.org/reports/tr29/). Functions accepting a set of EGCs must consist of a series of well-formed EGCs, broken by cluster breaks, terminated by the appropriate NUL terminator. Control characters are rejected, aside from two exceptions: a horizon- tal tab (', 0x09), and a newline ('', 0x0a) when the output plane is in scrolling mode. A newline outside of scrolling mode will be rejected. A tab will advance to the next tab stop, filling the space between with spaces. Tab stops are separated by eight columns, and the first char- acter of each line is a tab stop. These functions output to the ncplane's current cursor location. Aside from ncplane_puttext(), they do not move to the next line upon reaching the right extreme of the containing plane. If the entirety of the con- tent cannot be output, they will output as much as possible. Each of these base functions has two additional forms: • ncplane_putc_aligned(), etc.: accepts a row and an alignment type • ncplane_putc_yx(), etc.: accepts a row and column If a positional parameter is -1, no movement will be made along that axis. Passing -1, -1 to e.g. ncplane_putc_yx() is equivalent to call- ing the base form. These functions are implemented by moving the cur- sor, and then performing the output. The two steps are atomic on suc- cess (it is not possible for another caller to move the cursor between when it is positioned, and when output begins), and thus these func- tions ought generally be preferred to an explicit ncplane_cur- sor_move_yx(). Upon successful return, the cursor will follow the last cell output. RETURN VALUES ncplane_cursor_move_yx() returns -1 on error (invalid coordinate), or 0 on success. For output functions, a negative return indicates an error with the in- puts. Otherwise, the number of screen columns output is returned. It is entirely possible to get a short return, if there was insufficient room to output all EGCs. SEE ALSO fprintf(3) notcurses(3), notcurses_cell(3), notcurses_plane(3), stdarg(3), ascii(7), unicode(7), utf-8(7) AUTHORS nick black <nickblack@linux.com>. v3.0.8 notcurses_output(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | AUTHORS
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