Simplification to the ISO8610 parser in the imnplementation of date/time

functions.

FossilOrigin-Name: b9159f42a517a95ae52464c96431708c00b7bb36

manifest

@@ -1,5 +1,5 @@
-C Minor\sadjustments\sto\sthe\sMSVC\smakefile.
+C Simplification\sto\sthe\sISO8610\sparser\sin\sthe\simnplementation\sof\sdate/time\nfunctions.
-D 2016-01-14T18:01:16.348
+D 2016-01-14T19:32:46.777
 F Makefile.in cfa1ac03c4b414992fd53f24d978b45b0c21de55
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 2d8b2ad5a03315940bcb9e64145ab70850d66b4d
@@ -288,7 +288,7 @@ F src/build.c 9d497ff4bf3c82cecb520436e0e9963785627583
 F src/callback.c 7b44ce59674338ad48b0e84e7b72f935ea4f68b0
 F src/complete.c addcd8160b081131005d5bc2d34adf20c1c5c92f
 F src/ctime.c 60e135af364d777a9ab41c97e5e89cd224da6198
-F src/date.c e4655393bb403fa310eef66cc4583d75d4d7fd93
+F src/date.c 997651e3ee6c2818fbf7fcdb7156cef9eb3ece20
 F src/dbstat.c ffd63fc8ba7541476ced189b95e95d7f2bc63f78
 F src/delete.c 00af9f08a15ddc5cba5962d3d3e5bf2d67b2e7da
 F src/expr.c fe55c489362d1429c364e98c877514f4455f45a6
@@ -1412,7 +1412,7 @@ F tool/vdbe_profile.tcl 246d0da094856d72d2c12efec03250d71639d19f
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 8dedff3b9ac3e6bf9c131fee19f7d26dc1ebd61f
+P e2cba1bbfdcb24e35b2275e29071d8a4e4943417
-R ed5fce327e310c7f92985b6ea8c3a0f4
+R 79fbdde13a17c7cb82657d609276debb
-U mistachkin
+U drh
-Z a106ef292e4f8d6ed0328b1e83183a0f
+Z 2e5da468d29690cad1fa7e36751b6984

manifest.uuid

@@ -1 +1 @@
-e2cba1bbfdcb24e35b2275e29071d8a4e4943417
+b9159f42a517a95ae52464c96431708c00b7bb36

src/date.c

@@ -70,34 +70,49 @@ struct DateTime {
 
 
 /*
-** Convert zDate into one or more integers.  Additional arguments
+** Convert zDate into one or more integers according to the conversion
-** come in groups of 5 as follows:
+** specifier zFormat.
 **
-**       N       number of digits in the integer
+** zFormat[] contains 4 characters for each integer converted, except for
-**       min     minimum allowed value of the integer
+** the last integer which is specified by three characters.  The meaning
-**       max     maximum allowed value of the integer
+** of a four-character format specifiers ABCD is:
-**       nextC   first character after the integer
+**
-**       pVal    where to write the integers value.
+**    A:   number of digits to convert.  Always "2" or "4".
+**    B:   minimum value.  Always "0" or "1".
+**    C:   maximum value, decoded as:
+**           a:  12
+**           b:  14
+**           c:  24
+**           d:  31
+**           e:  59
+**           f:  9999
+**    D:   the separator character, or \000 to indicate this is the
+**         last number to convert.
+**
+** Example:  To translate an ISO-8601 date YYYY-MM-DD, the format would
+** be "40f-21a-20c".  The "40f-" indicates the 4-digit year followed by "-".
+** The "21a-" indicates the 2-digit month followed by "-".  The "20c" indicates
+** the 2-digit day which is the last integer in the set.
 **
-** Conversions continue until one with nextC==0 is encountered.
 ** The function returns the number of successful conversions.
 */
-static int getDigits(const char *zDate, ...){
+static int getDigits(const char *zDate, const char *zFormat, ...){
+  /* The aMx[] array translates the 3rd character of each format
+  ** spec into a max size:    a   b   c   d   e     f */
+  static const u16 aMx[] = { 12, 14, 24, 31, 59, 9999 };
   va_list ap;
-  int val;
-  int N;
-  int min;
-  int max;
-  int nextC;
-  int *pVal;
   int cnt = 0;
-  va_start(ap, zDate);
+  char nextC;
+  va_start(ap, zFormat);
   do{
-    N = va_arg(ap, int);
+    char N = zFormat[0] - '0';
-    min = va_arg(ap, int);
+    char min = zFormat[1] - '0';
-    max = va_arg(ap, int);
+    int val = 0;
-    nextC = va_arg(ap, int);
+    u16 max;
-    pVal = va_arg(ap, int*);
+
+    assert( zFormat[2]>='a' && zFormat[2]<='f' );
+    max = aMx[zFormat[2] - 'a'];
+    nextC = zFormat[3];
     val = 0;
     while( N-- ){
       if( !sqlite3Isdigit(*zDate) ){
@@ -106,12 +121,13 @@ static int getDigits(const char *zDate, ...){
       val = val*10 + *zDate - '0';
       zDate++;
     }
-    if( val<min || val>max || (nextC!=0 && nextC!=*zDate) ){
+    if( val<(int)min || val>(int)max || (nextC!=0 && nextC!=*zDate) ){
       goto end_getDigits;
     }
-    *pVal = val;
+    *va_arg(ap,int*) = val;
     zDate++;
     cnt++;
+    zFormat += 4;
   }while( nextC );
 end_getDigits:
   va_end(ap);
@@ -152,7 +168,7 @@ static int parseTimezone(const char *zDate, DateTime *p){
     return c!=0;
   }
   zDate++;
-  if( getDigits(zDate, 2, 0, 14, ':', &nHr, 2, 0, 59, 0, &nMn)!=2 ){
+  if( getDigits(zDate, "20b:20e", &nHr, &nMn)!=2 ){
     return 1;
   }
   zDate += 5;
@@ -173,13 +189,13 @@ zulu_time:
 static int parseHhMmSs(const char *zDate, DateTime *p){
   int h, m, s;
   double ms = 0.0;
-  if( getDigits(zDate, 2, 0, 24, ':', &h, 2, 0, 59, 0, &m)!=2 ){
+  if( getDigits(zDate, "20c:20e", &h, &m)!=2 ){
     return 1;
   }
   zDate += 5;
   if( *zDate==':' ){
     zDate++;
-    if( getDigits(zDate, 2, 0, 59, 0, &s)!=1 ){
+    if( getDigits(zDate, "20e", &s)!=1 ){
       return 1;
     }
     zDate += 2;
@@ -267,7 +283,7 @@ static int parseYyyyMmDd(const char *zDate, DateTime *p){
   }else{
     neg = 0;
   }
-  if( getDigits(zDate,4,0,9999,'-',&Y,2,1,12,'-',&M,2,1,31,0,&D)!=3 ){
+  if( getDigits(zDate, "40f-21a-21d", &Y, &M, &D)!=3 ){
     return 1;
   }
   zDate += 10;