remove system/ansi_c include from os

lib/pure/os.nim

@@ -26,7 +26,6 @@ elif defined(posix):
 else:
   {.error: "OS module not ported to your operating system!".}
 
-include "system/ansi_c"
 include ospaths
 
 when defined(posix):
@@ -37,6 +36,21 @@ when defined(posix):
     var
       pathMax {.importc: "PATH_MAX", header: "<stdlib.h>".}: cint
 
+proc c_remove(filename: cstring): cint {.
+  importc: "remove", header: "<stdio.h>".}
+proc c_rename(oldname, newname: cstring): cint {.
+  importc: "rename", header: "<stdio.h>".}
+proc c_system(cmd: cstring): cint {.
+  importc: "system", header: "<stdlib.h>".}
+proc c_strerror(errnum: cint): cstring {.
+  importc: "strerror", header: "<string.h>".}
+proc c_strlen(a: cstring): cint {.
+  importc: "strlen", header: "<string.h>", noSideEffect.}
+proc c_getenv(env: cstring): cstring {.
+  importc: "getenv", header: "<stdlib.h>".}
+proc c_putenv(env: cstring): cint {.
+  importc: "putenv", header: "<stdlib.h>".}
+
 proc osErrorMsg*(): string {.rtl, extern: "nos$1", deprecated.} =
   ## Retrieves the operating system's error flag, ``errno``.
   ## On Windows ``GetLastError`` is checked before ``errno``.

lib/system/ansi_c.nim

@@ -25,8 +25,6 @@ proc c_memset(p: pointer, value: cint, size: csize): pointer {.
   importc: "memset", header: "<string.h>", discardable.}
 proc c_strcmp(a, b: cstring): cint {.
   importc: "strcmp", header: "<string.h>", noSideEffect.}
-proc c_strlen(a: cstring): cint {.
-  importc: "strlen", header: "<string.h>", noSideEffect.}
 
 type
   C_JmpBuf {.importc: "jmp_buf", header: "<setjmp.h>".} = object
@@ -112,28 +110,4 @@ proc c_free(p: pointer) {.
 proc c_realloc(p: pointer, newsize: csize): pointer {.
   importc: "realloc", header: "<stdlib.h>".}
 
-when hostOS != "standalone":
-  when not declared(errno):
-    when defined(NimrodVM):
-      var vmErrnoWrapper {.importc.}: ptr cint
-      template errno: expr =
-        bind vmErrnoWrapper
-        vmErrnoWrapper[]
-    else:
-      var errno {.importc, header: "<errno.h>".}: cint ## error variable
-proc c_strerror(errnum: cint): cstring {.
-  importc: "strerror", header: "<string.h>".}
-
-proc c_remove(filename: cstring): cint {.
-  importc: "remove", header: "<stdio.h>".}
-proc c_rename(oldname, newname: cstring): cint {.
-  importc: "rename", header: "<stdio.h>".}
-
-proc c_system(cmd: cstring): cint {.
-  importc: "system", header: "<stdlib.h>".}
-proc c_getenv(env: cstring): cstring {.
-  importc: "getenv", header: "<stdlib.h>".}
-proc c_putenv(env: cstring): cint {.
-  importc: "putenv", header: "<stdlib.h>".}
-
 {.pop}

lib/system/debugger.nim

@@ -108,8 +108,8 @@ proc fileMatches(c, bp: cstring): bool =
   # and the character for the suffix does not exist or
   # is one of: \  /  :
   # depending on the OS case does not matter!
-  var blen: int = c_strlen(bp)
-  var clen: int = c_strlen(c)
+  var blen: int = bp.len
+  var clen: int = c.len
   if blen > clen: return false
   # check for \ /  :
   if clen-blen-1 >= 0 and c[clen-blen-1] notin {'\\', '/', ':'}:

lib/system/excpt.nim

@@ -255,7 +255,7 @@ proc raiseExceptionAux(e: ref Exception) =
         add(buf, "Error: unhandled exception: ")
         if not isNil(e.msg): add(buf, e.msg)
         add(buf, " [")
-        xadd(buf, e.name, c_strlen(e.name))
+        xadd(buf, e.name, e.name.len)
         add(buf, "]\n")
         showErrorMessage(buf)
       quitOrDebug()

lib/system/sysstr.nim

@@ -85,7 +85,7 @@ proc toNimStr(str: cstring, len: int): NimString {.compilerProc.} =
   copyMem(addr(result.data), str, len + 1)
 
 proc cstrToNimstr(str: cstring): NimString {.compilerRtl.} =
-  result = toNimStr(str, c_strlen(str))
+  result = toNimStr(str, str.len)
 
 proc copyString(src: NimString): NimString {.compilerRtl.} =
   if src != nil: