major restructuring, prepare for smp

code/user/personalities/posix/posix_path.c

@@ -0,0 +1,79 @@
+// posix_path.c - POSIX <-> native path translation
+#include <stddef.h>
+#include <string.h>
+#include "posix_path.h"
+
+static void FlipSlashes(char* s) {
+    for (; *s; s++) if (*s == '/') *s = '\\';
+}
+
+static int IsDriveMount(const char* p) {
+    return p && p[0] == '/' && p[1] >= '0' && p[1] <= '7' &&
+           (p[2] == '\0' || p[2] == '/');
+}
+
+const char* PosixTranslatePath(const char* in, char* out, size_t outSize) {
+    if (!in || !out || outSize < 4) return out;
+
+    if (strcmp(in, "/dev/null") == 0) return SYNTH_DEVNULL;
+    if (strcmp(in, "/dev/zero") == 0) return SYNTH_DEVZERO;
+
+    if (IsDriveMount(in)) {
+        out[0] = in[1];
+        out[1] = ':';
+        out[2] = '/';
+        const char* rest = (in[2] == '/') ? in + 3 : "";
+        size_t restLen = strlen(rest);
+        if (restLen + 4 > outSize) restLen = outSize - 4;
+        memcpy(out + 3, rest, restLen);
+        out[3 + restLen] = '\0';
+        FlipSlashes(out);
+        return out;
+    }
+
+    if (in[0] == '/') {
+        out[0] = '0';
+        out[1] = ':';
+        out[2] = '/';
+        size_t rest = strlen(in + 1);
+        if (rest + 4 > outSize) rest = outSize - 4;
+        memcpy(out + 3, in + 1, rest);
+        out[3 + rest] = '\0';
+    } else {
+        size_t len = strlen(in);
+        if (len + 1 > outSize) len = outSize - 1;
+        memcpy(out, in, len);
+        out[len] = '\0';
+    }
+
+    FlipSlashes(out);
+    return out;
+}
+
+void NativeToPosix(const char* in, char* out, size_t outSize) {
+    if (!in || !out || outSize == 0) return;
+
+    const char* src = in;
+    char drive = 0;
+    if (src[0] >= '0' && src[0] <= '7' && src[1] == ':' &&
+        (src[2] == '\\' || src[2] == '/')) {
+        drive = src[0];
+        src += 3;
+    }
+
+    size_t pos = 0;
+    if (drive && drive != '0') {
+        if (outSize < 4) { out[0] = '\0'; return; }
+        out[pos++] = '/';
+        out[pos++] = drive;
+        if (*src) out[pos++] = '/';
+    } else {
+        out[pos++] = '/';
+    }
+
+    while (*src && pos + 1 < outSize) {
+        out[pos++] = (*src == '\\') ? '/' : *src;
+        src++;
+    }
+    out[pos] = '\0';
+}