Add sys_nerr and sys_errlist.

Also keep the canonical errno list in LibC for now. The kernel gets it
from there. This makes building 3rd party code easier.

..also fix broken strchr().

1 files changed, 20 insertions, 47 deletions

diff --git a/LibC/string.cpp b/LibC/string.cpp
index f66b0613c2..3f5fafb1bc 100644
--- a/LibC/string.cpp
+++ b/LibC/string.cpp
@@ -115,12 +115,13 @@ char* strncpy(char* dest, const char* src, size_t n)
 
 char* strchr(const char* str, int c)
 {
-    if (!str)
-        return nullptr;
-    char* ptr = (char*)str;
-    while (*ptr && *ptr != c)
-        ++ptr;
-    return ptr;
+    char ch = c;
+    for (;; ++str) {
+        if (*str == ch)
+            return (char*)str;
+        if (!*str)
+            return nullptr;
+    }
 }
 
 char* strrchr(const char* str, int ch)
@@ -154,50 +155,22 @@ char* strncat(char *dest, const char *src, size_t n)
     return dest;
 }
 
+const char* sys_errlist[] = {
+#undef __ERROR
+#define __ERROR(a, b) #b,
+    __ENUMERATE_ALL_ERRORS
+#undef __ERROR
+};
+int sys_nerr = __errno_count;
+
 char* strerror(int errnum)
 {
-    switch (errnum) {
-    case 0: return "No error";
-    case EPERM: return "Operation not permitted";
-    case ENOENT: return "No such file or directory";
-    case ESRCH: return "No such process";
-    case EINTR: return "Interrupted syscall";
-    case EIO: return "I/O error";
-    case ENXIO: return "No such device/address";
-    case E2BIG: return "Argument list too long";
-    case ENOEXEC: return "Exec format error";
-    case EBADF: return "Bad fd number";
-    case ECHILD: return "No child processes";
-    case EAGAIN: return "Try again";
-    case ENOMEM: return "Out of memory";
-    case EACCES: return "Access denied";
-    case EFAULT: return "Bad address";
-    case ENOTBLK: return "Not a block device";
-    case EBUSY: return "Resource busy";
-    case EEXIST: return "File already exists";
-    case EXDEV: return "Cross-device link";
-    case ENODEV: return "No such device";
-    case ENOTDIR: return "Not a directory";
-    case EISDIR: return "Is a directory";
-    case EINVAL: return "Invalid argument";
-    case ENFILE: return "File table overflow";
-    case EMFILE: return "Too many open files";
-    case ENOTTY: return "Not a TTY";
-    case ETXTBSY: return "Text file busy";
-    case EFBIG: return "File too big";
-    case ENOSPC: return "No space left";
-    case ESPIPE: return "Illegal seek";
-    case EROFS: return "File system is read-only";
-    case EMLINK: return "Too many links";
-    case EPIPE: return "Broken pipe";
-    case EDOM: return "Math argument out of domain";
-    case ERANGE: return "Math result not representable";
-    case ENAMETOOLONG: return "Name too long";
-    case EOVERFLOW: return "Value too large for data type";
-    case ENOTIMPL: return "Not implemented";
+    if (errnum >= __errno_count) {
+        printf("strerror() missing string for errnum=%d\n", errnum);
+        return "Unknown error";
     }
-    printf("strerror() missing string for errnum=%d\n", errnum);
-    return "Unknown error";
+    return (char*)sys_errlist[errnum];
+
 }
 
 }