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code-golfing: cleanup osc color related code 

* adds missing function prototype
* move xgetcolor() prototype to win.h (that's where all the other x.c
  func prototype seems to be declared at)
* check for snprintf error/truncation
* reduces code duplication for osc 10/11/12
* unify osc_color_response() and osc4_color_response() into a single function

the latter two was suggested by Quentin Rameau in his patch review on
the hackers list.

ref.
https://git.suckless.org/st/commit/8629d9a1da72cc18568a8f146307b0e939b77ebf.html
This commit is contained in:
Bakkeby 2024-03-07 23:16:00 +01:00
parent e88f2bf20c
commit 6d5c2b3ddb
1 changed files with 46 additions and 73 deletions
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115
st.c
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@ -48,6 +48,8 @@
#endif // UNDERCURL_PATCH #endif // UNDERCURL_PATCH
#define STR_BUF_SIZ ESC_BUF_SIZ #define STR_BUF_SIZ ESC_BUF_SIZ
#define STR_ARG_SIZ ESC_ARG_SIZ #define STR_ARG_SIZ ESC_ARG_SIZ
#define STR_TERM_ST "\033\\"
#define STR_TERM_BEL "\007"
/* macros */ /* macros */
#define IS_SET(flag) ((term.mode & (flag)) != 0) #define IS_SET(flag) ((term.mode & (flag)) != 0)
@ -146,6 +148,7 @@ typedef struct {
size_t len; /* raw string length */ size_t len; /* raw string length */
char *args[STR_ARG_SIZ]; char *args[STR_ARG_SIZ];
int narg; /* nb of args */ int narg; /* nb of args */
char *term; /* terminator: ST or BEL */
} STREscape; } STREscape;
static void execsh(char *, char **); static void execsh(char *, char **);
@ -163,8 +166,7 @@ static void readcolonargs(char **, int, int[][CAR_PER_ARG]);
#endif // UNDERCURL_PATCH #endif // UNDERCURL_PATCH
static void csiparse(void); static void csiparse(void);
static void csireset(void); static void csireset(void);
static void osc4_color_response(int num); static void osc_color_response(int, int, int);
static void osc_color_response(int index, int num);
static int eschandle(uchar); static int eschandle(uchar);
static void strdump(void); static void strdump(void);
static void strhandle(void); static void strhandle(void);
@ -2363,39 +2365,28 @@ csireset(void)
} }
void void
osc4_color_response(int num) osc_color_response(int num, int index, int is_osc4)
{ {
int n; int n;
char buf[32]; char buf[32];
unsigned char r, g, b; unsigned char r, g, b;
if (xgetcolor(num, &r, &g, &b)) { if (xgetcolor(is_osc4 ? num : index, &r, &g, &b)) {
fprintf(stderr, "erresc: failed to fetch osc4 color %d\n", num); fprintf(stderr, "erresc: failed to fetch %s color %d\n",
is_osc4 ? "osc4" : "osc",
is_osc4 ? num : index);
return; return;
} }
n = snprintf(buf, sizeof buf, "\033]4;%d;rgb:%02x%02x/%02x%02x/%02x%02x\007", n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%02x%02x%s",
num, r, r, g, g, b, b); is_osc4 ? "4;" : "", num, r, r, g, g, b, b, strescseq.term);
if (n < 0 || n >= sizeof(buf)) {
fprintf(stderr, "error: %s while printing %s response\n",
n < 0 ? "snprintf failed" : "truncation occurred",
is_osc4 ? "osc4" : "osc");
} else {
ttywrite(buf, n, 1); ttywrite(buf, n, 1);
}
void
osc_color_response(int index, int num)
{
int n;
char buf[32];
unsigned char r, g, b;
if (xgetcolor(index, &r, &g, &b)) {
fprintf(stderr, "erresc: failed to fetch osc color %d\n", index);
return;
} }
n = snprintf(buf, sizeof buf, "\033]%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
num, r, r, g, g, b, b);
ttywrite(buf, n, 1);
} }
void void
@ -2408,6 +2399,11 @@ strhandle(void)
int i, x, y, x1, y1, x2, y2, numimages; int i, x, y, x1, y1, x2, y2, numimages;
int cx, cy; int cx, cy;
Line line; Line line;
const struct { int idx; char *str; } osc_table[] = {
{ defaultfg, "foreground" },
{ defaultbg, "background" },
{ defaultcs, "cursor" }
};
#if SCROLLBACK_PATCH #if SCROLLBACK_PATCH
int scr = IS_SET(MODE_ALTSCREEN) ? 0 : term.scr; int scr = IS_SET(MODE_ALTSCREEN) ? 0 : term.scr;
#else #else
@ -2458,62 +2454,34 @@ strhandle(void)
case 8: /* Clear Hyperlinks */ case 8: /* Clear Hyperlinks */
return; return;
case 10: case 10:
if (narg < 2)
break;
p = strescseq.args[1];
if (!strcmp(p, "?"))
osc_color_response(defaultfg, 10);
else if (xsetcolorname(defaultfg, p))
fprintf(stderr, "erresc: invalid foreground color: %s\n", p);
else
tfulldirt();
return;
case 11: case 11:
if (narg < 2)
break;
p = strescseq.args[1];
if (!strcmp(p, "?"))
osc_color_response(defaultbg, 11);
else if (xsetcolorname(defaultbg, p))
fprintf(stderr, "erresc: invalid background color: %s\n", p);
else
tfulldirt();
return;
case 12: case 12:
if (narg < 2) if (narg < 2)
break; break;
p = strescseq.args[1]; p = strescseq.args[1];
if ((j = par - 10) < 0 || j >= LEN(osc_table))
break; /* shouldn't be possible */
if (!strcmp(p, "?")) if (!strcmp(p, "?")) {
osc_color_response(defaultcs, 12); osc_color_response(par, osc_table[j].idx, 0);
else if (xsetcolorname(defaultcs, p)) } else if (xsetcolorname(osc_table[j].idx, p)) {
fprintf(stderr, "erresc: invalid cursor color: %s\n", p); fprintf(stderr, "erresc: invalid %s color: %s\n",
else osc_table[j].str, p);
} else {
tfulldirt(); tfulldirt();
}
return; return;
case 4: /* color set */ case 4: /* color set */
if ((par == 4 && narg < 3) || narg < 2) if (narg < 3)
break; break;
p = strescseq.args[((par == 4) ? 2 : 1)]; p = strescseq.args[2];
/* FALLTHROUGH */ /* FALLTHROUGH */
case 104: /* color reset */ case 104: /* color reset */
if (par == 10)
j = defaultfg;
else if (par == 11)
j = defaultbg;
else if (par == 12)
j = defaultcs;
else
j = (narg > 1) ? atoi(strescseq.args[1]) : -1; j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
if (p && !strcmp(p, "?")) if (p && !strcmp(p, "?")) {
osc4_color_response(j); osc_color_response(j, 0, 1);
else if (xsetcolorname(j, p)) { } else if (xsetcolorname(j, p)) {
if (par == 104 && narg <= 1) { if (par == 104 && narg <= 1) {
xloadcols(); xloadcols();
return; /* color reset without parameter */ return; /* color reset without parameter */
@ -2521,8 +2489,10 @@ strhandle(void)
fprintf(stderr, "erresc: invalid color j=%d, p=%s\n", fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
j, p ? p : "(null)"); j, p ? p : "(null)");
} else { } else {
if (j == defaultbg) /*
xclearwin(); * TODO if defaultbg color is changed, borders
* are dirty
*/
tfulldirt(); tfulldirt();
} }
return; return;
@ -2669,7 +2639,7 @@ strdump(void)
fprintf(stderr, "(%02x)", c); fprintf(stderr, "(%02x)", c);
} }
} }
fprintf(stderr, "ESC\\\n"); fprintf(stderr, (strescseq.term[0] == 0x1b) ? "ESC\\\n" : "BEL\n");
} }
void void
@ -2861,6 +2831,7 @@ tcontrolcode(uchar ascii)
case '\a': /* BEL */ case '\a': /* BEL */
if (term.esc & ESC_STR_END) { if (term.esc & ESC_STR_END) {
/* backwards compatibility to xterm */ /* backwards compatibility to xterm */
strescseq.term = STR_TERM_BEL;
strhandle(); strhandle();
} else { } else {
xbell(); xbell();
@ -3074,8 +3045,10 @@ eschandle(uchar ascii)
tcursor(CURSOR_LOAD); tcursor(CURSOR_LOAD);
break; break;
case '\\': /* ST -- String Terminator */ case '\\': /* ST -- String Terminator */
if (term.esc & ESC_STR_END) if (term.esc & ESC_STR_END) {
strescseq.term = STR_TERM_ST;
strhandle(); strhandle();
}
break; break;
default: default:
fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",