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#include <u.h>
#include <libc.h>
#include <ctype.h>
static char*
skiptext(char *q)
{
while(*q!='\0' && *q!=' ' && *q!='\t' && *q!='\r' && *q!='\n')
q++;
return q;
}
static char*
skipwhite(char *q)
{
while(*q==' ' || *q=='\t' || *q=='\r' || *q=='\n')
q++;
return q;
}
static char* months[] = {
"jan", "feb", "mar", "apr",
"may", "jun", "jul", "aug",
"sep", "oct", "nov", "dec"
};
static int
strcmplwr(char *a, char *b, int n)
{
char *eb;
eb = b+n;
while(*a && *b && b<eb){
if(tolower(*a) != tolower(*b))
return 1;
a++;
b++;
}
if(b==eb)
return 0;
return *a != *b;
}
int
strtotm(char *p, Tm *tmp)
{
char *q, *r;
int j;
Tm tm;
int delta;
delta = 0;
memset(&tm, 0, sizeof(tm));
tm.mon = -1;
tm.hour = -1;
tm.min = -1;
tm.year = -1;
tm.mday = -1;
for(p=skipwhite(p); *p; p=skipwhite(q)){
q = skiptext(p);
/* look for time in hh:mm[:ss] */
if(r = memchr(p, ':', q-p)){
tm.hour = strtol(p, 0, 10);
tm.min = strtol(r+1, 0, 10);
if(r = memchr(r+1, ':', q-(r+1)))
tm.sec = strtol(r+1, 0, 10);
else
tm.sec = 0;
continue;
}
/* look for month */
for(j=0; j<12; j++)
if(strcmplwr(p, months[j], 3)==0){
tm.mon = j;
break;
}
if(j!=12)
continue;
/* look for time zone [A-Z][A-Z]T */
if(q-p==3 && 'A' <= p[0] && p[0] <= 'Z'
&& 'A' <= p[1] && p[1] <= 'Z' && p[2] == 'T'){
strecpy(tm.zone, tm.zone+4, p);
continue;
}
if(p[0]=='+'||p[0]=='-')
if(q-p==5 && strspn(p+1, "0123456789") == 4){
delta = (((p[1]-'0')*10+p[2]-'0')*60+(p[3]-'0')*10+p[4]-'0')*60;
if(p[0] == '-')
delta = -delta;
continue;
}
if(strspn(p, "0123456789") == q-p){
j = strtol(p, nil, 10);
if(1 <= j && j <= 31)
tm.mday = j;
if(j >= 1900)
tm.year = j-1900;
}
}
if(tm.mon<0 || tm.year<0
|| tm.hour<0 || tm.min<0
|| tm.mday<0)
return -1;
*tmp = *localtime(tm2sec(&tm)-delta);
return 0;
}
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