From 6ea757f492d0fffccff816fbc8216bca792d7be1 Mon Sep 17 00:00:00 2001
From: YuQing <384681@qq.com>
Date: Wed, 28 Sep 2022 22:13:57 +0800
Subject: [PATCH] add function fc_itoa

---
 HISTORY             |   3 +-
 src/common_define.h |  19 ++++++++
 src/shared_func.c   | 103 ++++++++++++++++++++++++++++++++++++++++++++
 src/shared_func.h   |   7 +++
 4 files changed, 131 insertions(+), 1 deletion(-)

diff --git a/HISTORY b/HISTORY
index 81f0bda..d21aece 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,6 +1,7 @@
 
-Version 1.62  2022-09-27
+Version 1.62  2022-09-28
   * add function fc_sleep_us
+  * add function fc_itoa
 
 Version 1.61  2022-09-21
   * get_base_path_from_conf_file_ex support parameter: noent_log_level
diff --git a/src/common_define.h b/src/common_define.h
index c1f9653..af3693b 100644
--- a/src/common_define.h
+++ b/src/common_define.h
@@ -159,6 +159,25 @@ extern int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int kind);
 #define FC_TIME_UNIT_USECOND  'u'  //microsecond
 #define FC_TIME_UNIT_NSECOND  'n'  //nanosecond
 
+#define FC_1E01                     10LL
+#define FC_1E02                    100LL
+#define FC_1E03                   1000LL
+#define FC_1E04                  10000LL
+#define FC_1E05                 100000LL
+#define FC_1E06                1000000LL
+#define FC_1E07               10000000LL
+#define FC_1E08              100000000LL
+#define FC_1E09             1000000000LL
+#define FC_1E10            10000000000LL
+#define FC_1E11           100000000000LL
+#define FC_1E12          1000000000000LL
+#define FC_1E13         10000000000000LL
+#define FC_1E14        100000000000000LL
+#define FC_1E15       1000000000000000LL
+#define FC_1E16      10000000000000000LL
+#define FC_1E17     100000000000000000LL
+#define FC_1E18    1000000000000000000LL
+
 #define STRERROR(no) (strerror(no) != NULL ? strerror(no) : "Unkown error")
 
 #if defined(OS_LINUX)
diff --git a/src/shared_func.c b/src/shared_func.c
index 85ab39b..529505e 100644
--- a/src/shared_func.c
+++ b/src/shared_func.c
@@ -4060,3 +4060,106 @@ int fc_safe_write_file_init(SafeWriteFileInfo *fi,
     fi->fd = -1;
     return 0;
 }
+
+int fc_itoa(int64_t n, char *buff)
+{
+    char *p;
+    int start;
+    int len;
+    int i;
+
+    if (n < 0) {
+        n *= -1;
+        *buff = '-';
+        start = 1;
+    } else {
+        start = 0;
+    }
+
+    if (n < FC_1E16) {
+        if (n < FC_1E08) {
+            if (n < FC_1E04) {
+                p = buff + start;
+                if (n < FC_1E02) {
+                    if (n < FC_1E01) {
+                        *p++ = '0' + n;
+                    } else {
+                        *p++ = '0' + n / 10;
+                        *p++ = '0' + n % 10;
+                    }
+                } else {
+                    if (n < FC_1E03) {
+                        *p++ = '0' + n / 100;
+                    } else {
+                        *p++ = '0' + n / 1000;
+                        *p++ = '0' + (n % 1000) / 100;
+                    }
+                    *p++ = '0' + (n % 100) / 10;
+                    *p++ = '0' + n % 10;
+                }
+                return p - buff;
+            } else {
+                if (n < FC_1E06) {
+                    if (n < FC_1E05) {
+                        len = 5;
+                    } else {
+                        len = 6;
+                    }
+                } else {
+                    if (n < FC_1E07) {
+                        len = 7;
+                    } else {
+                        len = 8;
+                    }
+                }
+            }
+        } else {
+            if (n < FC_1E12) {
+                if (n < FC_1E10) {
+                    if (n < FC_1E09) {
+                        len = 9;
+                    } else {
+                        len = 10;
+                    }
+                } else {
+                    if (n < FC_1E11) {
+                        len = 11;
+                    } else {
+                        len = 12;
+                    }
+                }
+            } else {
+                if (n < FC_1E14) {
+                    if (n < FC_1E13) {
+                        len = 13;
+                    } else {
+                        len = 14;
+                    }
+                } else {
+                    if (n < FC_1E15) {
+                        len = 15;
+                    } else {
+                        len = 16;
+                    }
+                }
+            }
+        }
+    } else {
+        if (n < FC_1E18) {
+            if (n < FC_1E17) {
+                len = 17;
+            } else {
+                len = 18;
+            }
+        } else {
+            len = 19;
+        }
+    }
+
+    p = buff + start + len - 1;
+    for (i=0; i<len; i++) {
+        *p-- = '0' + n % 10;
+        n /= 10;
+    }
+    return start + len;
+}
diff --git a/src/shared_func.h b/src/shared_func.h
index 5f93cf3..b32e0ba 100644
--- a/src/shared_func.h
+++ b/src/shared_func.h
@@ -1175,6 +1175,13 @@ int fc_get_last_lines(const char *filename, char *buff,
 bool fc_path_contains(const string_t *path, const string_t *needle,
         int *result);
 
+/** itoa output as decimal number
+ *  parameters:
+ *      n: the number to convert
+ *      buff: store the converted string
+ *  return: string length
+*/
+int fc_itoa(int64_t n, char *buff);
 
 /** sleep in microseconds
  *  parameters: