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Implement getcwd() for XNU

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This commit is contained in:
Justine Tunney 2021-01-30 08:54:12 -08:00
parent 417797d218
commit 95173645a1
17 changed files with 239 additions and 77 deletions
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39
libc/runtime/finddebugbinary.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/bits/safemacros.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/macros.h"
@ -31,19 +32,31 @@
* @return path to debug binary, or -1 w/ errno
*/
const char *FindDebugBinary(void) {
static char buf[PATH_MAX];
if (buf[0]) return &buf[0];
const char *const trybins[] = {program_invocation_name,
(const char *)getauxval(AT_EXECFN)};
for (unsigned i = 0; i < ARRAYLEN(trybins); ++i) {
const char *res = trybins[i];
unsigned len = strlen(res);
if (4 < len && len < sizeof(buf) - 5) {
if (strcmp(res + len - 4, ".dbg") == 0) return res;
/* try suffixing extension, e.g. .com → .com.dbg */
memcpy(mempcpy(buf, res, len), ".dbg", 5);
if (fileexists(buf)) return &buf[0];
buf[0] = '\0';
unsigned i, len;
char buf[2][PATH_MAX];
static char res[PATH_MAX];
const char *bins[4], *pwd;
bins[0] = program_invocation_name;
bins[1] = (const char *)getauxval(AT_EXECFN);
pwd = emptytonull(getenv("PWD"));
for (i = 0; i < 2; ++i) {
if (pwd && bins[i] && bins[i][0] != '/' && bins[i][0] != '\\' &&
strlen(pwd) + 1 + strlen(bins[i]) + 1 <= ARRAYLEN(buf[0])) {
strcpy(buf[i], pwd);
strcat(buf[i], "/");
strcat(buf[i], bins[i]);
bins[i + 2] = buf[i];
}
}
for (i = 0; i < 4; ++i) {
if (!bins[i]) continue;
len = strlen(bins[i]);
memcpy(res, bins[i], len + 1);
if (!endswith(res, ".dbg") && len + 3 + 1 <= ARRAYLEN(res)) {
strcat(res, ".dbg");
}
if (fileexists(res)) {
return res;
}
}
errno = ENOENT;