libgo/go/syscall/signame.c

   1 /* signame.c -- get the name of a signal
   2
   3    Copyright 2012 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include <string.h>
   8
   9 #include "runtime.h"
  10 #include "arch.h"
  11 #include "malloc.h"
  12
  13 String Signame (intgo sig) __asm__ (GOSYM_PREFIX "syscall.Signame");
  14
  15 String
  16 Signame (intgo sig)
  17 {
  18   const char* s = NULL;
  19   char buf[100];
  20   size_t len;
  21   byte *data;
  22   String ret;
  23
  24 #if defined(HAVE_STRSIGNAL)
  25   s = strsignal (sig);
  26 #endif
  27
  28   if (s == NULL)
  29     {
  30       snprintf(buf, sizeof buf, "signal %ld", (long) sig);
  31       s = buf;
  32     }
  33   len = __builtin_strlen (s);
  34   data = runtime_mallocgc (len, nil, false);
  35   __builtin_memcpy (data, s, len);
  36   // lowercase first letter: Bad -> bad, but STREAM -> STREAM.
  37   if ('A' <= data[0] && data[0] <= 'Z' && 'a' <= data[1] && data[1] <= 'z')
  38     data[0] += 'a' - 'A';
  39   ret.str = data;
  40   ret.len = len;
  41   return ret;
  42 }