File: strftime.c

package info (click to toggle)
gnuplot 3.5beta6.340-5
  • links: PTS
  • area: main
  • in suites: hamm
  • size: 4,792 kB
  • ctags: 4,205
  • sloc: ansic: 41,878; asm: 539; makefile: 498; objc: 379; csh: 297; sh: 277; pascal: 194; perl: 138; lisp: 88
file content (214 lines) | stat: -rw-r--r-- 4,971 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
#define NOTIMEZONE

#ifndef lint
static char *RCSid="$Id: strftime.c,v 1.4 1995/12/07 21:41:12 drd Exp $";
#endif

/*
 * Implementation of strftime for systems missing this (e.g. vaxctrl)
 *
 * This code was written based on the NeXT strftime man-page, sample output of
 * the function and an ANSI-C quickreference chart. This code does not use
 * parts of any existing strftime implementation.
 *
 * Apparently not all format chars are implemented, but this was all I had in
 * my documentation.
 *
 * (written by Alexander Lehmann)
 */

#include <time.h>
#include <string.h>
#include <stdio.h>
#include "setshow.h"  /* for days/months */

#ifdef TEST /* test case */
#define strftime _strftime
#else
#define const /**/
#endif


static void fill(from, pto, pmaxsize)
     char *from;
     char **pto;
     size_t *pmaxsize;
{
  strncpy(*pto, from, *pmaxsize);
  if(*pmaxsize<strlen(from)) {
    (*pto)+=*pmaxsize;
    *pmaxsize=0;
  } else {
    (*pto)+=strlen(from);
    (*pmaxsize)-=strlen(from);
  }
}

static void number(num, pad, pto, pmaxsize)
     int num;
     int pad;
     char **pto;
     size_t *pmaxsize;
{
  char str[100];
  
  sprintf(str, "%0*d", pad, num);
  fill(str, pto, pmaxsize);
}

size_t strftime(s, max, format, tp)
     char *s;
     size_t max;
     const char *format;
     const struct tm *tp;
{
  char *start=s;
  size_t maxsize=max;

  if(max>0) {
    while(*format && max>0) {
      if(*format!='%') {
      	*s++=*format++;
	max--;
      } else {
        format++;
	switch(*format++) {
	  case 'a': /* abbreviated weekday name */
	    if(tp->tm_wday>=0 && tp->tm_wday<=6)
	      fill(abbrev_day_names[tp->tm_wday], &s, &max);
	    break;
	  case 'A': /* full name of the weekday */
	    if(tp->tm_wday>=0 && tp->tm_wday<=6)
	      fill(full_day_names[tp->tm_wday], &s, &max);
	    break;
	  case 'b': /* abbreviated month name */
	    if(tp->tm_mon>=0 && tp->tm_mon<=11)
	      fill(abbrev_month_names[tp->tm_mon], &s, &max);
	    break;
	  case 'B': /* full name of month */
	    if(tp->tm_mon>=0 && tp->tm_mon<=11)
	      fill(full_month_names[tp->tm_mon], &s, &max);
	    break;
	  case 'c': /* locale's date and time reprensentation */
	    strftime(s, max, "%a %b %X %Y", tp);
	    max-=strlen(s);
	    s+=strlen(s);
	    break;
	  case 'd': /* day of the month (01-31) */
	    number(tp->tm_mday, 2, &s, &max);
	    break;
	  case 'H': /* hour of the day (00-23) */
	    number(tp->tm_hour, 2, &s, &max);
	    break;
	  case 'I': /* hour of the day (01-12) */
	    number((tp->tm_hour+11)%12+1, 2, &s, &max);
	    break;
	  case 'j': /* day of the year (001-366) */
	    number(tp->tm_yday+1, 3, &s, &max);
	    break;
	  case 'm': /* month of the year (01-12) */
	    number(tp->tm_mon+1, 2,&s, &max);
	    break;
	  case 'M': /* minute (00-59) */
	    number(tp->tm_min, 2, &s, &max);
	    break;
	  case 'p': /* locale's version of AM or PM */
	    fill(tp->tm_hour>=6 ? "PM" : "AM", &s, &max);
	    break;
	  case 'S': /* seconds (00-59) */
	    number(tp->tm_sec, 2, &s, &max);
	    break;
	  case 'U': /* week number of the year (00-53) with Sunday as the first day of the week */
	    number((tp->tm_yday-(tp->tm_yday-tp->tm_wday+7)%7+7)/7, 1, &s, &max);
	    break;
	  case 'w': /* weekday (Sunday=0 to Saturday=6) */
	    number(tp->tm_wday, 1, &s, &max);
	    break;
	  case 'W': /* week number of the year (00-53) with Monday as the first day of the week */
	    number((tp->tm_yday-(tp->tm_yday-tp->tm_wday+8)%7+7)/7, 2, &s, &max);
	    break;
	  case 'x': /* locale's date representation */
	    strftime(s, max, "%a %b %d %Y", tp);
	    max-=strlen(s);
	    s+=strlen(s);
	    break;
	  case 'X': /* locale's time representation */
#ifndef NOTIMEZONE
	    strftime(s, max, "%H:%M:%S %Z", tp);
#else
	    strftime(s, max, "%H:%M:%S", tp);
#endif
	    max-=strlen(s);
	    s+=strlen(s);
	    break;
	  case 'y': /* two-digit year representation (00-99) */
	    number(tp->tm_year%100, 2, &s, &max);
	    break;
	  case 'Y': /* four-digit year representation */
	    number(tp->tm_year+1900, 2, &s, &max);
	    break;
#ifndef NOTIMEZONE
	  case 'Z': /* time zone name */
	    fill(tp->tm_zone, &s, &max);
	    break;
#endif
	  case '%': /* percent sign */
	  default:
	    *s++=*(format-1);
	    max--;
	    break;
	  }
      }
    }
    if(s-start<maxsize) {
      *s++='\0';
    } else {
      *(s-1)='\0';
    }
  }
  
  return s-start;
}

#ifdef TEST

#undef strftime
#define test(s)				\
	printf("%s -> ",s );		\
	_strftime(str, 100, s, ts);	\
	printf("%s - ", str);		\
	strftime(str, 100, s, ts);	\
	printf("%s\n", str)

int main()
{
  char str[100];
  struct tm *ts;
  time_t t;
  int i;

  t=time(NULL);

  ts=localtime(&t);

  test("%c");
  test("test%%test");
  test("%a %b %d %X %Y");
  test("%x %X");
  test("%A %B %U");
  test("%I:%M %p %j %w");

  t-=245*24*60*60;

  for(i=0;i<366;i++) {
    ts=localtime(&t);
    printf("%03d: ", i);
    test("%a %d %m %W");
    t+=24*60*60;
  }

  return 0;
}

#endif