itoa

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@529 ec762483-ff6d-05da-a07a-a48fb63a330f

2 files changed, 102 insertions, 78 deletions

diff --git a/utils/static_utoa.h b/utils/static_utoa.h
index fe5f6d92..3af9fbb6 100755
--- a/utils/static_utoa.h
+++ b/utils/static_utoa.h
@@ -2,96 +2,20 @@
 #define STATIC_UTOA_H
 
 #include "threadlocal.h"
-
-
-#include <string>
-#include <cstring>
-
-#define DIGIT_LOOKUP_TABLE 0
+#include "utoa.h"
 
 namespace {
-THREADLOCAL char utoa_buf[] = "01234567890123456789"; // to put end of string character at buf[20]
-const unsigned utoa_bufsize=sizeof(utoa_buf);
-const unsigned utoa_bufsizem1=utoa_bufsize-1;
-#ifdef DIGIT_LOOKUP_TABLE
-char digits[] = "0123456789";
-#endif
-}
-
-inline char digit_to_char(int d) {
-  return
-#ifdef DIGIT_LOOKUP_TABLE
-    digits[d];
-#else
-    '0'+d;
-#endif
-}
-
-// returns n in string [return,num); *num=0 yourself before calling if you want a c_str
-inline char *utoa(char *num,unsigned n) {
-  if ( !n ) {
-    *--num='0';
-  } else {
-    unsigned rem;
-    // 3digit lookup table, divide by 1000 faster?
-    while ( n ) {
-#if 1
-      rem = n;
-      n /= 10;
-      rem -= 10*n;		// maybe this is faster than mod because we are already dividing
-#else
-      rem = n%10; // would optimizer combine these together?
-      n   = n/10;
-#endif
-      *--num = digit_to_char(rem);
-    }
-  }
-  return num;
+THREADLOCAL char utoa_buf[utoa_bufsize]; // to put end of string character at buf[20]
 }
 
 inline char *static_utoa(unsigned n) {
   return utoa(utoa_buf+utoa_bufsizem1,n);
 }
 
-//returns position of '\0' terminating number written starting at to
-inline char* append_utoa(char *to,unsigned n) {
-  char *s=static_utoa(n);
-  int ns=(utoa_buf+utoa_bufsize)-s;
-  std::memcpy(to,s,ns);
-  return to+ns;
-}
-
-// so named to avoid gcc segfault when named itoa
-inline char *itoa(char *p,int n) {
-  if (n<0) {
-    p=utoa(p,-n); // TODO: check that (unsigned)(-INT_MIN) == 0x1000000 in 2s complement and not == 0
-    *--p='-';
-    return p;
-  } else
-    return utoa(p,n);
-}
-
 inline char *static_itoa(int n) {
   return itoa(utoa_buf+utoa_bufsizem1,n);
 }
 
-
-inline std::string utos(unsigned n) {
-  const int bufsz=20;
-  char buf[bufsz];
-  char *end=buf+bufsz;
-  char *p=utoa(end,n);
-  return std::string(p,end);
-}
-
-inline std::string itos(int n) {
-  const int bufsz=20;
-  char buf[bufsz];
-  char *end=buf+bufsz;
-  char *p=itoa(end,n);
-  return std::string(p,end);
-}
-
 #ifdef ITOA_SAMPLE
 # include <cstdio>
 # include <sstream>
diff --git a/utils/utoa.h b/utils/utoa.h
new file mode 100755
index 00000000..6c1cf2de
--- /dev/null
+++ b/utils/utoa.h
@@ -0,0 +1,100 @@
+#ifndef UTOA_H
+#define UTOA_H
+
+#include <string>
+#include <cstring>
+
+#ifndef DIGIT_LOOKUP_TABLE
+# define DIGIT_LOOKUP_TABLE 0
+#endif
+
+const unsigned utoa_bufsize=21;
+const unsigned utoa_bufsizem1=utoa_bufsize-1;
+
+#ifdef DIGIT_LOOKUP_TABLE
+namespace {
+char digits[] = "0123456789";
+}
+#endif
+
+inline char digit_to_char(int d) {
+  return
+#ifdef DIGIT_LOOKUP_TABLE
+    digits[d];
+#else
+    '0'+d;
+#endif
+}
+
+// returns n in string [return,num); *num=0 yourself before calling if you want a c_str
+inline char *utoa(char *num,unsigned n) {
+  if ( !n ) {
+    *--num='0';
+  } else {
+    unsigned rem;
+    // 3digit lookup table, divide by 1000 faster?
+    while ( n ) {
+#if 1
+      rem = n;
+      n /= 10;
+      rem -= 10*n;		// maybe this is faster than mod because we are already dividing
+#else
+      rem = n%10; // would optimizer combine these together?
+      n   = n/10;
+#endif
+      *--num = digit_to_char(rem);
+    }
+  }
+  return num;
+}
+
+
+inline char *itoa(char *p,int n) {
+  if (n<0) {
+    p=utoa(p,-n); // TODO: check that (unsigned)(-INT_MIN) == 0x1000000 in 2s complement and not == 0
+    *--p='-';
+    return p;
+  } else
+    return utoa(p,n);
+}
+
+inline std::string utos(unsigned n) {
+  char buf[utoa_bufsize];
+  char *end=buf+utoa_bufsize;
+  char *p=utoa(end,n);
+  return std::string(p,end);
+}
+
+inline std::string itos(int n) {
+  char buf[utoa_bufsize];
+  char *end=buf+utoa_bufsize;
+  char *p=itoa(end,n);
+  return std::string(p,end);
+}
+
+//returns position of '\0' terminating number written starting at to
+inline char* append_utoa(char *to,unsigned n) {
+  char buf[utoa_bufsize];
+  char *end=buf+utoa_bufsize;
+  char *s=utoa(end,n);
+  int ns=end-s;
+  std::memcpy(to,s,ns);
+  to+=ns;
+  *to++=0;
+  return to;
+}
+
+//returns position of '\0' terminating number written starting at to
+inline char* append_itoa(char *to,unsigned n) {
+  char buf[utoa_bufsize];
+  char *end=buf+utoa_bufsize;
+  char *s=itoa(end,n);
+  int ns=end-s;
+  std::memcpy(to,s,ns);
+  to+=ns;
+  *to++=0;
+  return to;
+}
+
+
+#endif