07b35d356c
This patch adds a ring buffer for scrollback to the terminal. The advantage of using a ring buffer is that the common case, scrolling with no static screen content, can be achieved very efficiently by incrementing and decrementing the starting line (modulo buffer size). The scrollback buffer is limited to HISTSIZE lines in order to bound memory usage. As the lines are allocated on demand, it is possible to implement unlimited scrollback with few changes. If the terminal is reset, the scroll back buffer is reset, too. (apply st-scrollback-ringbuffer-0.8.5.diff on top of colorscheme)
130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
/* See LICENSE for license details. */
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#include <stdint.h>
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#include <sys/types.h>
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/* macros */
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#define MAX(a, b) ((a) < (b) ? (b) : (a))
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#define LEN(a) (sizeof(a) / sizeof(a)[0])
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#define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
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#define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
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#define DEFAULT(a, b) (a) = (a) ? (a) : (b)
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#define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
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#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
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(a).bg != (b).bg)
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#define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
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(t1.tv_nsec-t2.tv_nsec)/1E6)
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#define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
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#define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
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#define IS_TRUECOL(x) (1 << 24 & (x))
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#define HISTSIZE 2000
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enum glyph_attribute {
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ATTR_NULL = 0,
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ATTR_BOLD = 1 << 0,
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ATTR_FAINT = 1 << 1,
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ATTR_ITALIC = 1 << 2,
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ATTR_UNDERLINE = 1 << 3,
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ATTR_BLINK = 1 << 4,
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ATTR_REVERSE = 1 << 5,
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ATTR_INVISIBLE = 1 << 6,
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ATTR_STRUCK = 1 << 7,
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ATTR_WRAP = 1 << 8,
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ATTR_WIDE = 1 << 9,
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ATTR_WDUMMY = 1 << 10,
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ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
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};
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enum selection_mode {
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SEL_IDLE = 0,
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SEL_EMPTY = 1,
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SEL_READY = 2
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};
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enum selection_type {
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SEL_REGULAR = 1,
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SEL_RECTANGULAR = 2
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};
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enum selection_snap {
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SNAP_WORD = 1,
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SNAP_LINE = 2
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};
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typedef unsigned char uchar;
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typedef unsigned int uint;
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typedef unsigned long ulong;
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typedef unsigned short ushort;
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typedef uint_least32_t Rune;
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#define Glyph Glyph_
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typedef struct {
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Rune u; /* character code */
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ushort mode; /* attribute flags */
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uint32_t fg; /* foreground */
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uint32_t bg; /* background */
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} Glyph;
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typedef Glyph *Line;
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typedef union {
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int i;
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uint ui;
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float f;
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const void *v;
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const char *s;
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} Arg;
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void die(const char *, ...);
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void redraw(void);
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void draw(void);
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void printscreen(const Arg *);
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void printsel(const Arg *);
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void sendbreak(const Arg *);
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void toggleprinter(const Arg *);
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int tattrset(int);
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void tnew(int, int);
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void tresize(int, int);
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void tsetdirtattr(int);
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void tupdatebgcolor(int, int);
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void tupdatefgcolor(int, int);
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void ttyhangup(void);
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int ttynew(const char *, char *, const char *, char **);
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size_t ttyread(void);
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void ttyresize(int, int);
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void ttywrite(const char *, size_t, int);
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void resettitle(void);
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void selclear(void);
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void selinit(void);
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void selstart(int, int, int);
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void selextend(int, int, int, int);
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int selected(int, int);
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char *getsel(void);
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size_t utf8encode(Rune, char *);
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void *xmalloc(size_t);
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void *xrealloc(void *, size_t);
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char *xstrdup(const char *);
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/* config.h globals */
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extern char *utmp;
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extern char *scroll;
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extern char *stty_args;
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extern char *vtiden;
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extern wchar_t *worddelimiters;
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extern int allowaltscreen;
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extern int allowwindowops;
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extern char *termname;
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extern unsigned int tabspaces;
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extern unsigned int defaultfg;
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extern unsigned int defaultbg;
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extern unsigned int defaultcs;
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