st

my build of st - simple terminal
git clone git://git.kocotian.pl/st.git
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commit 12c25bcea973ced6e3b3b03f05cdb3f45fcd9f7f
parent 326586ba434fb873ebdb81f385ebe838419a98a7
Author: Aurélien Aptel <aurelien.aptel@gmail.com>
Date:   Mon, 30 Aug 2010 16:48:18 +0200

added support for alternate screen.

Diffstat:
Mst.c | 70++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 56 insertions(+), 14 deletions(-)

diff --git a/st.c b/st.c @@ -50,7 +50,7 @@ enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_SAVE, CURSOR_LOAD }; enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 }; enum { GLYPH_SET=1, GLYPH_DIRTY=2 }; -enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 }; +enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 }; enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 }; enum { SCREEN_UPDATE, SCREEN_REDRAW }; @@ -86,7 +86,8 @@ typedef struct { typedef struct { int row; /* nb row */ int col; /* nb col */ - Line* line; /* screen */ + Line* line; /* screen */ + Line* alt; /* alternate screen */ TCursor c; /* cursor */ int top; /* top scroll limit */ int bot; /* bottom scroll limit */ @@ -156,6 +157,7 @@ static void tscrolldown(int); static void tsetattr(int*, int); static void tsetchar(char); static void tsetscroll(int, int); +static void tswapscreen(void); static void ttynew(void); static void ttyread(void); @@ -337,13 +339,24 @@ tnew(int col, int row) { /* set screen size */ term.row = row, term.col = col; term.line = malloc(term.row * sizeof(Line)); - for(row = 0 ; row < term.row; row++) + term.alt = malloc(term.row * sizeof(Line)); + for(row = 0 ; row < term.row; row++) { term.line[row] = malloc(term.col * sizeof(Glyph)); + term.alt [row] = malloc(term.col * sizeof(Glyph)); + } /* setup screen */ treset(); } void +tswapscreen(void) { + Line* tmp = term.line; + term.line = term.alt; + term.alt = tmp; + term.mode ^= MODE_ALTSCREEN; +} + +void tscrolldown (int n) { int i; Line temp; @@ -712,10 +725,21 @@ csihandle(void) { case 25: term.c.state |= CURSOR_HIDE; break; - case 1048: /* XXX: no alt. screen to erase/save */ + case 1047: + if(IS_SET(MODE_ALTSCREEN)) { + tclearregion(0, 0, term.col-1, term.row-1); + tswapscreen(); + } + break; + case 1048: + tcursor(CURSOR_LOAD); + break; case 1049: tcursor(CURSOR_LOAD); - tclearregion(0, 0, term.col-1, term.row-1); + if(IS_SET(MODE_ALTSCREEN)) { + tclearregion(0, 0, term.col-1, term.row-1); + tswapscreen(); + } break; default: goto unknown; @@ -761,10 +785,21 @@ csihandle(void) { case 25: term.c.state &= ~CURSOR_HIDE; break; - case 1048: - case 1049: /* XXX: no alt. screen to erase/save */ + case 1047: + if(IS_SET(MODE_ALTSCREEN)) + tclearregion(0, 0, term.col-1, term.row-1); + else + tswapscreen(); + break; + case 1048: + tcursor(CURSOR_SAVE); + break; + case 1049: tcursor(CURSOR_SAVE); - tclearregion(0, 0, term.col-1, term.row-1); + if(IS_SET(MODE_ALTSCREEN)) + tclearregion(0, 0, term.col-1, term.row-1); + else + tswapscreen(); break; default: goto unknown; } @@ -889,19 +924,19 @@ tputc(char c) { treset(); term.esc = 0; break; - case '=': /* DECPAM */ + case '=': /* DECPAM -- Application keypad */ term.mode |= MODE_APPKEYPAD; term.esc = 0; break; - case '>': /* DECPNM */ + case '>': /* DECPNM -- Normal keypad */ term.mode &= ~MODE_APPKEYPAD; term.esc = 0; break; - case '7': + case '7': /* DECSC -- Save Cursor*/ tcursor(CURSOR_SAVE); term.esc = 0; break; - case '8': + case '8': /* DECRC -- Restore Cursor */ tcursor(CURSOR_LOAD); term.esc = 0; break; @@ -961,21 +996,28 @@ tresize(int col, int row) { return; /* free uneeded rows */ - for(i = row; i < term.row; i++) + for(i = row; i < term.row; i++) { free(term.line[i]); + free(term.alt[i]); + } /* resize to new height */ term.line = realloc(term.line, row * sizeof(Line)); + term.line = realloc(term.alt, row * sizeof(Line)); /* resize each row to new width, zero-pad if needed */ for(i = 0; i < minrow; i++) { term.line[i] = realloc(term.line[i], col * sizeof(Glyph)); + term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph)); memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph)); + memset(term.alt[i] + mincol, 0, (col - mincol) * sizeof(Glyph)); } /* allocate any new rows */ - for(/* i == minrow */; i < row; i++) + for(/* i == minrow */; i < row; i++) { term.line[i] = calloc(col, sizeof(Glyph)); + term.alt [i] = calloc(col, sizeof(Glyph)); + } /* update terminal size */ term.col = col, term.row = row;