[hackers] [scc] [driver] use dynamic instead of fixed sized tools args || Quentin Rameau
commit 4759de47d57fcd644fef2efddfd47894e1e1f2fb
Author: Quentin Rameau <quinq_AT_fifth.space>
AuthorDate: Wed Jun 8 16:18:14 2016 +0200
Commit: Quentin Rameau <quinq_AT_fifth.space>
CommitDate: Wed Jun 15 18:50:46 2016 +0200
[driver] use dynamic instead of fixed sized tools args
This was motivated by the fact that scc shouldn't have an arbitrary
limit of passed arguments (but the one imposed by the host), although
the most current use case would be less than a decade.
diff --git a/driver/posix/scc.c b/driver/posix/scc.c
index 5522b54..2d5ec31 100644
--- a/driver/posix/scc.c
+++ b/driver/posix/scc.c
_AT_@ -14,8 +14,6 @@
#include "../../inc/arg.h"
#include "../../inc/cc.h"
-#define NARGS 64
-
enum {
CC1,
TEEIR,
_AT_@ -29,12 +27,12 @@ enum {
};
static struct tool {
- char cmd[PATH_MAX];
- char *args[NARGS];
- char bin[16];
- char *outfile;
- int nargs, in, out, error;
- pid_t pid;
+ char cmd[PATH_MAX];
+ char **args;
+ char bin[16];
+ char *outfile;
+ int nparams, nargs, in, out, init, error;
+ pid_t pid;
} tools[] = {
[CC1] = { .bin = "cc1", .cmd = PREFIX "/libexec/scc/", },
[TEEIR] = { .bin = "tee", .cmd = "tee", },
_AT_@ -48,7 +46,7 @@ static struct tool {
char *argv0;
static char *arch;
-static char *tmpobjs[NARGS - 2];
+static char **tmpobjs;
static int nobjs;
static int Eflag, Sflag, kflag;
_AT_@ -70,6 +68,38 @@ terminate(void)
}
}
+static char **
+newitem(char **array, int num, char *item)
+{
+ char **ar = xrealloc(array, (num + 1) * sizeof(char **));
+
+ ar[num] = item;
+
+ return ar;
+}
+
+static void
+addarg(int tool, char *arg)
+{
+ struct tool *t = &tools[tool];
+
+ if (t->nargs < 1)
+ t->nargs = 1;
+
+ t->args = newitem(t->args, t->nargs++, arg);
+}
+
+static void
+setargv0(int tool, char *arg)
+{
+ struct tool *t = &tools[tool];
+
+ if (t->nargs > 0)
+ t->args[0] = arg;
+ else
+ t->args = newitem(t->args, t->nargs++, arg);
+}
+
static int
inittool(int tool)
{
_AT_@ -77,39 +107,43 @@ inittool(int tool)
size_t binln;
int n;
- if (!t->args[0]) {
- switch (tool) {
- case CC1:
- case CC2:
- binln = strlen(t->bin);
- if (arch) {
- n = snprintf(t->bin + binln,
- sizeof(t->bin) - binln,
- "-%s", arch);
- if (n < 0 || n >= sizeof(t->bin))
- die("scc: target tool bin too long");
- binln = strlen(t->bin);
- }
+ if (t->init)
+ return tool;
- if (strlen(t->cmd) + binln + 1 > sizeof(t->cmd))
- die("scc: target tool path too long");
- strcat(t->cmd, t->bin);
- break;
- case AS:
- t->nargs = 2;
- t->args[1] = "-o";
- break;
- case LD:
- t->nargs = 2;
- t->args[1] = "-o";
- break;
- default:
- break;
+ switch (tool) {
+ case CC1: /* FALLTHROUGH */
+ case CC2:
+ binln = strlen(t->bin);
+ if (arch) {
+ n = snprintf(t->bin + binln,
+ sizeof(t->bin) - binln,
+ "-%s", arch);
+ if (n < 0 || n >= sizeof(t->bin))
+ die("scc: target tool bin too long");
+ binln = strlen(t->bin);
}
- t->args[0] = t->bin;
+ if (strlen(t->cmd) + binln + 1 > sizeof(t->cmd))
+ die("scc: target tool path too long");
+ strcat(t->cmd, t->bin);
+ break;
+ case LD:
+ addarg(tool, "-o");
+ if (!t->outfile)
+ t->outfile = xstrdup("a.out");
+ addarg(tool, t->outfile);
+ break;
+ case AS:
+ addarg(tool, "-o");
+ break;
+ default:
+ break;
}
+ setargv0(tool, t->bin);
+ t->nparams = t->nargs;
+ t->init = 1;
+
return tool;
}
_AT_@ -142,44 +176,33 @@ outfilename(char *path, char *ext)
return new;
}
-static void
-addarg(int tool, char *arg) {
- struct tool *t = &tools[tool];
-
- if (!(t->nargs < NARGS - 2)) /* 2: argv0, NULL terminator */
- die("scc: too many parameters given");
-
- t->args[++t->nargs] = arg;
-}
-
static int
settool(int tool, char *infile, int nexttool)
{
struct tool *t = &tools[tool];
- int fds[2];
+ int i, fds[2];
static int fdin;
switch (tool) {
case TEEIR:
t->outfile = outfilename(infile, "ir");
- t->args[1] = t->outfile;
+ addarg(tool, t->outfile);
break;
case TEEQBE:
t->outfile = outfilename(infile, "qbe");
- t->args[1] = t->outfile;
+ addarg(tool, t->outfile);
break;
case TEEAS:
t->outfile = outfilename(infile, "as");
- t->args[1] = t->outfile;
+ addarg(tool, t->outfile);
break;
case AS:
t->outfile = outfilename(infile, "o");
- t->args[2] = t->outfile;
+ addarg(tool, t->outfile);
break;
case LD:
- if (!t->outfile)
- t->outfile = xstrdup("a.out");
- t->args[2] = t->outfile;
+ for (i = 0; i < nobjs; ++i)
+ addarg(tool, xstrdup(tmpobjs[i]));
break;
default:
break;
_AT_@ -188,8 +211,8 @@ settool(int tool, char *infile, int nexttool)
if (fdin) {
t->in = fdin;
fdin = 0;
- } else {
- t->args[t->nargs + 1] = infile;
+ } else if (infile) {
+ addarg(tool, xstrdup(infile));
}
if (nexttool < LAST_TOOL && tool != AS) {
_AT_@ -199,6 +222,8 @@ settool(int tool, char *infile, int nexttool)
fdin = fds[0];
}
+ addarg(tool, NULL);
+
return tool;
}
_AT_@ -227,6 +252,7 @@ spawn(int tool)
break;
}
}
+
static int
toolfor(char *file)
{
_AT_@ -252,7 +278,7 @@ static void
validatetools(void)
{
struct tool *t;
- int tool, st;
+ int i, tool, st;
for (tool = 0; tool < LAST_TOOL; ++tool) {
t = &tools[tool];
if (t->pid) {
_AT_@ -261,8 +287,10 @@ validatetools(void)
t->error = 1;
exit(-1);
}
- free(t->outfile);
+ for (i = t->nparams; i < t->nargs; ++i)
+ free(t->args[i]);
t->outfile = NULL;
+ t->nargs = t->nparams;
t->pid = 0;
t->error = 0;
}
_AT_@ -272,14 +300,7 @@ validatetools(void)
static void
linkobjs(void)
{
- int i;
-
- settool(inittool(LD), NULL, LAST_TOOL);
-
- for (i = 0; tmpobjs[i] && i < nobjs; ++i)
- addarg(LD, tmpobjs[i]);
-
- spawn(LD);
+ spawn(settool(inittool(LD), NULL, LAST_TOOL));
validatetools();
if (kflag)
_AT_@ -324,10 +345,12 @@ build(char *file)
nexttool = LD;
break;
case LD: /* FALLTHROUGH */
- if (argfile)
- addarg(LD, file);
- else
- tmpobjs[nobjs++] = xstrdup(tools[AS].outfile);
+ if (argfile) {
+ addarg(tool, xstrdup(file));
+ } else {
+ tmpobjs = newitem(tmpobjs, nobjs++,
+ xstrdup(tools[AS].outfile));
+ }
default:
nexttool = LAST_TOOL;
continue;
_AT_@ -376,7 +399,7 @@ main(int argc, char *argv[])
arch = EARGF(usage());
break;
case 'o':
- tools[LD].outfile = EARGF(usage());
+ tools[LD].outfile = xstrdup(EARGF(usage()));
break;
case 'w':
addarg(CC1, "-w");
Received on Wed Jun 15 2016 - 19:00:04 CEST
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: Wed Jun 15 2016 - 19:00:33 CEST