remove several warnings (Johannes Stezenbach)

CHANGES

@@ -5,6 +5,7 @@
     Unfortunately, correct overflow checking enlarged the routine by 20%.
     (reported by Manuel Novoa III)
   two stdio bug fixes (also reported by Manuel Novoa III)
+  remove several warnings (Johannes Stezenbach)
 
 0.23:
   update sys/soundcard.h

contrib/elftrunc.c

@@ -121,8 +121,8 @@ void trunc64(int fd)
   {
     if ((n=read(in,buf,sizeof(buf)))>0)
     {
-      write(out,buf,(size_t)((len<(size_t)n)?len:n));
-      len-=(len<(size_t)n)?len:n;
+      write(out,buf,(size_t)((len<(size_t)n)?len:(size_t)n));
+      len-=(len<(size_t)n)?len:(size_t)n;
     } else die(2,"read error");
   }
 

include/getopt.h

@@ -5,8 +5,6 @@
 
 __BEGIN_DECLS
 
-extern int optopt;
-
 struct option {
   const char* name;
   int has_arg;

include/unistd.h

@@ -9,8 +9,8 @@
 
 __BEGIN_DECLS
 
-int optind,opterr;
-char *optarg;
+extern int optind,opterr,optopt;
+extern char *optarg;
 int getopt(int argc, char *const argv[], const char *options);
 
 /* Values for the second argument to access.

lib/__dtostr.c

@@ -13,17 +13,21 @@ static int copystring(char* buf,int maxlen, const char* s) {
 
 int __dtostr(double d,char *buf,unsigned int maxlen,unsigned int prec,unsigned int prec2) {
 #if 1
-  unsigned long long *x=(unsigned long long *)&d;
+  union {
+    unsigned long long l;
+    double d;
+  } u;
+  u.d=d;
   /* step 1: extract sign, mantissa and exponent */
-  signed long e=((*x>>52)&((1<<11)-1))-1023;
+  signed long e=((u.l>>52)&((1<<11)-1))-1023;
 #else
 #if __BYTE_ORDER == __LITTLE_ENDIAN
   signed long e=(((((unsigned long*)&d)[1])>>20)&((1<<11)-1))-1023;
 #else
   signed long e=(((*((unsigned long*)&d))>>20)&((1<<11)-1))-1023;
 #endif
 #endif
-/*  unsigned long long m=*x & ((1ull<<52)-1); */
+/*  unsigned long long m=u.l & ((1ull<<52)-1); */
   /* step 2: exponent is base 2, compute exponent for base 10 */
   signed long e10;
   /* step 3: calculate 10^e10 */

lib/__isinf.c

@@ -1,8 +1,12 @@
 #include <math.h>
 
 int isinf(double d) {
-  unsigned long long *x=(unsigned long long *)&d;
-  return (*x==0x7FF0000000000000ll?1:*x==0xFFF0000000000000ll?-1:0);
+  union {
+    unsigned long long l;
+    double d;
+  } u;
+  u.d=d;
+  return (u.l==0x7FF0000000000000ll?1:u.l==0xFFF0000000000000ll?-1:0);
 }
 int __isinf(double d) __attribute__((alias("isinf")));
 

lib/__isnan.c

@@ -1,8 +1,12 @@
 #include <math.h>
 
 int isnan(double d) {
-  unsigned long long *x=(unsigned long long *)&d;
-  return (*x==0x7FF8000000000000ll || *x==0x7FF0000000000000 || *x==0xfff8000000000000);
+  union {
+    unsigned long long l;
+    double d;
+  } u;
+  u.d=d;
+  return (u.l==0x7FF8000000000000ll || u.l==0x7FF0000000000000ll || u.l==0xfff8000000000000ll);
 }
 int __isnan(double d) __attribute__((alias("isnan")));
 

liblatin1/latin1-isgraph.c

@@ -2,6 +2,6 @@
 
 int isgraph(int x) {
   unsigned char c=x&0xff;
-  return (c>=33 && c<=126) || (c>=161 && c<=255);
+  return (c>=33 && c<=126) || c>=161;
 }
 

liblatin1/latin1-islower.c

@@ -2,5 +2,5 @@
 
 int islower(int c) {
   unsigned char x=c&0xff;
-  return (x>='a' && x<='z') || (x>=223 && x<=255 && x!=247);
+  return (x>='a' && x<='z') || (x>=223 && x!=247);
 }