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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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