Make redbean StoreAsset() work better

- Better UBSAN error messages
- POSIX Advisory Locks polyfills
- Move redbean manual to /.help.txt
- System call memory safety in ASAN mode
- Character classification now does UNICODE

tool/build/compile.c

@@ -91,6 +91,9 @@ bool wantpg;
 bool wantrecord;
 bool wantubsan;
 bool touchtarget;
+bool no_sanitize_null;
+bool no_sanitize_alignment;
+bool no_sanitize_pointer_overflow;
 
 char *cmd;
 char *comdbg;
@@ -400,6 +403,12 @@ int main(int argc, char *argv[]) {
     } else if (!strcmp(argv[i], "-fno-sanitize=all")) {
       wantasan = false;
       wantubsan = false;
+    } else if (!strcmp(argv[i], "-fno-sanitize=null")) {
+      if (isgcc && ccversion >= 6) no_sanitize_null = true;
+    } else if (!strcmp(argv[i], "-fno-sanitize=alignment")) {
+      if (isgcc && ccversion >= 6) no_sanitize_alignment = true;
+    } else if (!strcmp(argv[i], "-fno-sanitize=pointer-overflow")) {
+      if (isgcc && ccversion >= 6) no_sanitize_pointer_overflow = true;
     } else if (startswith(argv[i], "-fsanitize=implicit") &&
                strstr(argv[i], "integer")) {
       if (isgcc) AddArg(argv[i]);
@@ -470,6 +479,15 @@ int main(int argc, char *argv[]) {
       AddArg("-fsanitize=undefined");
       AddArg("-fno-data-sections");
     }
+    if (no_sanitize_null) {
+      AddArg("-fno-sanitize=null");
+    }
+    if (no_sanitize_alignment) {
+      AddArg("-fno-sanitize=alignment");
+    }
+    if (no_sanitize_pointer_overflow) {
+      AddArg("-fno-sanitize=pointer-overflow");
+    }
     if (wantframe) {
       AddArg("-fno-omit-frame-pointer");
     }

tool/build/lib/errnos.S

@@ -21,14 +21,14 @@
 	.macro	.errno	local:req linux:req
 	.globl	\local
 	.long	\local-kLinuxErrnos
-	.long	\linux
+	.byte	\linux
 	.endm
 
 //	Lookup table translating errnos between systems.
 //
 //	@see	libc/sysv/systemfive.S
 	.rodata
-	.align	8
+	.align	4
 kLinuxErrnos:
 	.errno	EPERM,1
 	.errno	ENOENT,2
@@ -85,47 +85,18 @@ kLinuxErrnos:
 	.errno	EAFNOSUPPORT,97
 	.errno	EADDRINUSE,98
 	.errno	EADDRNOTAVAIL,99
-	.errno	ECHRNG,44
 	.errno	EL2NSYNC,45
 	.errno	EL3HLT,46
 	.errno	EL3RST,47
 	.errno	ELNRNG,48
-	.errno	EUNATCH,49
-	.errno	ENOCSI,50
-	.errno	EL2HLT,51
-	.errno	EBADE,52
-	.errno	EBADR,53
-	.errno	EXFULL,54
-	.errno	ENOANO,55
-	.errno	EBADRQC,56
-	.errno	EBADSLT,57
-	.errno	ENOSTR,60
-	.errno	ENODATA,61
 	.errno	ETIME,62
-	.errno	ENOSR,63
 	.errno	ENONET,64
-	.errno	ENOPKG,65
 	.errno	EREMOTE,66
-	.errno	ENOLINK,67
-	.errno	EADV,68
-	.errno	ESRMNT,69
-	.errno	ECOMM,70
 	.errno	EPROTO,71
-	.errno	EMULTIHOP,72
-	.errno	EDOTDOT,73
 	.errno	EBADMSG,74
 	.errno	EOVERFLOW,75
-	.errno	ENOTUNIQ,76
-	.errno	EBADFD,77
-	.errno	EREMCHG,78
-	.errno	ELIBACC,79
-	.errno	ELIBBAD,80
-	.errno	ELIBSCN,81
-	.errno	ELIBMAX,82
-	.errno	ELIBEXEC,83
 	.errno	EILSEQ,84
 	.errno	ERESTART,85
-	.errno	ESTRPIPE,86
 	.errno	ENETDOWN,100
 	.errno	ENETUNREACH,101
 	.errno	ENETRESET,102
@@ -143,23 +114,10 @@ kLinuxErrnos:
 	.errno	EALREADY,114
 	.errno	EINPROGRESS,115
 	.errno	ESTALE,116
-	.errno	EUCLEAN,117
-	.errno	ENOTNAM,118
-	.errno	ENAVAIL,119
-	.errno	EISNAM,120
-	.errno	EREMOTEIO,121
 	.errno	EDQUOT,122
-	.errno	ENOMEDIUM,123
-	.errno	EMEDIUMTYPE,124
 	.errno	ECANCELED,125
-	.errno	ENOKEY,126
-	.errno	EKEYEXPIRED,127
-	.errno	EKEYREVOKED,128
-	.errno	EKEYREJECTED,129
 	.errno	EOWNERDEAD,130
 	.errno	ENOTRECOVERABLE,131
-	.errno	ERFKILL,132
-	.errno	EHWPOISON,133
+	.long	0
+	.byte	0
 	.endobj	kLinuxErrnos,globl
-	kLinuxErrnosLength = (.-kLinuxErrnos)/8
-	.globl	kLinuxErrnosLength

tool/build/lib/xlaterrno.c

@@ -21,42 +21,21 @@
 #include "libc/runtime/carsort.h"
 #include "tool/build/lib/xlaterrno.h"
 
-struct LinuxErrno {
+struct thatispacked LinuxErrno {
   int32_t local;
-  int32_t linux;
+  uint8_t linux;
 };
 
-extern const char kLinuxErrnosLength[];
 extern const struct LinuxErrno kLinuxErrnos[];
-static struct LinuxErrno *errnos;
 
 /**
  * Turns local errno into Linux errno.
  */
 int XlatErrno(int local) {
-  static bool once;
-  long i, n, m, l, r;
-  n = (uintptr_t)kLinuxErrnosLength;
-  if (!once) {
-    errnos = malloc(sizeof(struct LinuxErrno) * n);
-    for (i = 0; i < n; ++i) {
-      errnos[i].local =
-          *(int *)((intptr_t)kLinuxErrnos + kLinuxErrnos[i].local);
-      errnos[i].linux = kLinuxErrnos[i].linux;
-    }
-    carsort100(n, (void *)errnos);
-    once = true;
-  }
-  l = 0;
-  r = n - 1;
-  while (l <= r) {
-    m = (l + r) / 2;
-    if (errnos[m].local < local) {
-      l = m + 1;
-    } else if (errnos[m].local > local) {
-      r = m - 1;
-    } else {
-      return errnos[m].linux;
+  int i;
+  for (i = 0; kLinuxErrnos[i].local; ++i) {
+    if (local == *(int *)((intptr_t)kLinuxErrnos + kLinuxErrnos[i].local)) {
+      return kLinuxErrnos[i].linux;
     }
   }
   return ENOSYS;

tool/build/runit.c

@@ -42,7 +42,6 @@
 #include "libc/stdio/stdio.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/af.h"
-#include "libc/sysv/consts/ai.h"
 #include "libc/sysv/consts/ex.h"
 #include "libc/sysv/consts/exit.h"
 #include "libc/sysv/consts/f.h"