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143 lines
5.8 KiB
Markdown
143 lines
5.8 KiB
Markdown
% notcurses_output(3)
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% nick black <nickblack@linux.com>
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% v1.7.5
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# NAME
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notcurses_output - output to ncplanes
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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**static inline int ncplane_putc(struct ncplane* n, const cell* c);**
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**int ncplane_putc_yx(struct ncplane* n, int y, int x, const cell* c);**
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**static inline int ncplane_putchar(struct ncplane* n, char c);**
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**static inline int ncplane_putchar_yx(struct ncplane* n, int y, int x, char c);**
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**int ncplane_putchar_stained(struct ncplane* n, char c);**
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**static inline int ncplane_putwc(struct ncplane* n, wchar_t w);**
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**int ncplane_putwc_yx(struct ncplane* n, int y, int x, wchar_t w);**
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**static inline int ncplane_putwc_stained(struct ncplane* n, wchar_t w);**
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**static inline int ncplane_putegc(struct ncplane* n, const char* gclust, int* sbytes);**
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**int ncplane_putegc_yx(struct ncplane* n, int y, int x, const char* gclust, int* sbytes);**
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**int ncplane_putegc_stained(struct ncplane* n, const char* gclust, int* sbytes);**
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**static inline int ncplane_putwegc(struct ncplane* n, const wchar_t* gclust, int* sbytes);**
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**static inline int ncplane_putwegc_yx(struct ncplane* n, int y, int x, const wchar_t* gclust, int* sbytes);**
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**int ncplane_putwegc_stained(struct ncplane* n, const wchar_t* gclust, int* sbytes);**
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**int ncplane_putstr_yx(struct ncplane* n, int y, int x, const char* gclustarr);**
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**static inline int ncplane_putstr(struct ncplane* n, const char* gclustarr);**
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**int ncplane_putstr_aligned(struct ncplane* n, int y, ncalign_e align, const char* s);**
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**int ncplane_putstr_stained(struct ncplane* n, const char* s);**
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**static inline int ncplane_putwstr(struct ncplane* n, const wchar_t* gclustarr);**
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**int ncplane_putwstr_yx(struct ncplane* n, int y, int x, const wchar_t* gclustarr);**
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**static inline int ncplane_putwstr_aligned(struct ncplane* n, int y, ncalign_e align, const wchar_t* gclustarr);**
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**int ncplane_putwstr_stained(struct ncplane* n, const wchar_t* gclustarr);**
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**static inline int ncplane_putnstr(struct ncplane* n, size_t s, const char* gclustarr);**
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**int ncplane_putnstr_yx(struct ncplane* n, int y, int x, size_t s, const char* gclusters);**
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**int ncplane_putnstr_aligned(struct ncplane* n, int y, ncalign_e align, size_t s, const char* s);**
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**int ncplane_vprintf_aligned(struct ncplane* n, int y, ncalign_e align, const char* format, va_list ap);**
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**int ncplane_vprintf_yx(struct ncplane* n, int y, int x, const char* format, va_list ap);**
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**static inline int ncplane_vprintf(struct ncplane* n, const char* format, va_list ap);**
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**static inline int ncplane_printf(struct ncplane* n, const char* format, ...);**
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**static inline int ncplane_printf_yx(struct ncplane* n, int y, int x, const char* format, ...);**
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**static inline int ncplane_printf_aligned(struct ncplane* n, int y, ncalign_e align, const char* format, ...);**
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**int ncplane_cursor_move_yx(struct ncplane* n, int y, int x);**
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**int ncplane_puttext(struct ncplane* n, int y, ncalign_e align, const char* text, size_t* bytes);**
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# DESCRIPTION
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These functions write EGCs (Extended Grapheme Clusters) to the specified
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**struct ncplane**s. The following inputs are supported:
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* **ncplane_putc()**: writes a single cell (see **notcurses_cell(3)**)
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* **ncplane_putchar()**: writes a single 7-bit ASCII character
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* **ncplane_putwc()**: writes a single **wchar_t** (following UTF-8 conversion)
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* **ncplane_putwegc()**: writes a single EGC from an array of **wchar_t**
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* **ncplane_putegc()**: writes a single EGC from an array of UTF-8
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* **ncplane_putstr()**: writes a set of EGCs from an array of UTF-8
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* **ncplane_putwstr()**: writes a set of EGCs from an array of **wchar_t**
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* **ncplane_vprintf()**: formatted output using **va_list**
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* **ncplane_printf()**: formatted output using variadic arguments
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* **ncplane_puttext()**: multi-line, line-broken, aligned text
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All of these use the **ncplane**'s active styling, save **notcurses_putc()**,
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which uses the cell's styling. Functions accepting a single EGC expect a series
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of **wchar_t** terminated by **L'\0'** or a series of UTF-8 **char** terminated
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by **'\0'**. The EGC must be well-formed, and must not contain any cluster
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breaks. For more information, consult [Unicode® Standard Annex #29](https://unicode.org/reports/tr29/).
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Functions accepting a set of EGCs must consist of a series of well-formed EGCs,
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broken by cluster breaks, terminated by the appropriate NUL terminator.
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These functions output to the `ncplane`'s current cursor location. Aside from
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**ncplane_puttext()**, they *do not* move to the next line upon reaching the
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right extreme of the containing plane. If the entirety of the content cannot be
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output, they will output as much as possible.
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Each of these base functions has two additional forms:
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* **ncplane_putc_aligned()**, etc.: accepts a row and an alignment type
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* **ncplane_putc_yx()**, etc.: accepts a row and column
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If a positional parameter is -1, no movement will be made along that axis.
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Passing **-1, -1** to e.g. **ncplane_putc_yx()** is equivalent to calling the
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base form. These functions are implemented by moving the cursor, and then
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performing the output. The two steps are *atomic* on success (it is not possible
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for another caller to move the cursor between when it is positioned, and when
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output begins), and thus these functions ought generally be preferred to an
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explicit **ncplane_cursor_move_yx()**.
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Upon successful return, the cursor will follow the last cell output.
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# RETURN VALUES
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**ncplane_cursor_move_yx()** returns -1 on error (invalid coordinate), or 0
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on success.
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For output functions, a negative return indicates an error with the inputs.
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Otherwise, the number of *screen columns* output is returned. It is entirely
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possible to get a short return, if there was insufficient room to output all
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EGCs.
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# SEE ALSO
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**fprintf(3)**
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**notcurses(3)**,
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**notcurses_cell(3)**,
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**notcurses_plane(3)**,
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**stdarg(3)**,
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**ascii(7)**,
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**unicode(7)**,
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**utf-8(7)**
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