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

119
st.c
View File

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