| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: header.c,v 2.30 2017/05/07 16:14:19 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* header.c - routines for reading and writing information headers. |
| 6 |
* |
| 7 |
* Externals declared in resolu.h |
| 8 |
* |
| 9 |
* newheader(t,fp) start new information header identified by string t |
| 10 |
* headidval(r,s) copy header identifier value in s to r |
| 11 |
* dateval(t,s) get capture date value as UTC |
| 12 |
* gmtval(t,s) get GMT as UTC |
| 13 |
* fputdate(t,fp) put out the given UTC |
| 14 |
* fputnow(fp) put out the current date and time |
| 15 |
* printargs(ac,av,fp) print an argument list to fp, followed by '\n' |
| 16 |
* formatval(r,s) copy the format value in s to r |
| 17 |
* fputformat(s,fp) write "FORMAT=%s" to fp |
| 18 |
* getheader(fp,f,p) read header from fp, calling f(s,p) on each line |
| 19 |
* globmatch(pat, str) check for glob match of str against pat |
| 20 |
* checkheader(i,p,o) check header format from i against p and copy to o |
| 21 |
* |
| 22 |
* To copy header from input to output, use getheader(fin, fputs, fout) |
| 23 |
*/ |
| 24 |
|
| 25 |
#include "copyright.h" |
| 26 |
|
| 27 |
#include <ctype.h> |
| 28 |
|
| 29 |
#include "rtio.h" |
| 30 |
#include "resolu.h" |
| 31 |
|
| 32 |
#define MAXLINE 2048 |
| 33 |
|
| 34 |
extern time_t timegm(struct tm *tm); |
| 35 |
|
| 36 |
const char HDRSTR[] = "#?"; /* information header magic number */ |
| 37 |
|
| 38 |
const char FMTSTR[] = "FORMAT="; /* format identifier */ |
| 39 |
|
| 40 |
const char TMSTR[] = "CAPDATE="; /* capture date identifier */ |
| 41 |
const char GMTSTR[] = "GMT="; /* GMT identifier */ |
| 42 |
|
| 43 |
static gethfunc mycheck; |
| 44 |
|
| 45 |
|
| 46 |
void |
| 47 |
newheader( /* identifying line of information header */ |
| 48 |
const char *s, |
| 49 |
FILE *fp |
| 50 |
) |
| 51 |
{ |
| 52 |
fputs(HDRSTR, fp); |
| 53 |
fputs(s, fp); |
| 54 |
putc('\n', fp); |
| 55 |
} |
| 56 |
|
| 57 |
|
| 58 |
int |
| 59 |
headidval( /* get header id (return true if is id) */ |
| 60 |
char *r, |
| 61 |
const char *s |
| 62 |
) |
| 63 |
{ |
| 64 |
const char *cp = HDRSTR; |
| 65 |
|
| 66 |
while (*cp) if (*cp++ != *s++) return(0); |
| 67 |
if (r == NULL) return(1); |
| 68 |
while (*s && !isspace(*s)) *r++ = *s++; |
| 69 |
*r = '\0'; |
| 70 |
return(1); |
| 71 |
} |
| 72 |
|
| 73 |
|
| 74 |
int |
| 75 |
dateval( /* convert capture date line to UTC */ |
| 76 |
time_t *tloc, |
| 77 |
const char *s |
| 78 |
) |
| 79 |
{ |
| 80 |
struct tm tms; |
| 81 |
const char *cp = TMSTR; |
| 82 |
|
| 83 |
while (*cp) if (*cp++ != *s++) return(0); |
| 84 |
while (isspace(*s)) s++; |
| 85 |
if (!*s) return(0); |
| 86 |
if (sscanf(s, "%d:%d:%d %d:%d:%d", |
| 87 |
&tms.tm_year, &tms.tm_mon, &tms.tm_mday, |
| 88 |
&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6) |
| 89 |
return(0); |
| 90 |
if (tloc == NULL) |
| 91 |
return(1); |
| 92 |
tms.tm_mon--; |
| 93 |
tms.tm_year -= 1900; |
| 94 |
tms.tm_isdst = -1; /* ask mktime() to figure out DST */ |
| 95 |
*tloc = mktime(&tms); |
| 96 |
return(1); |
| 97 |
} |
| 98 |
|
| 99 |
|
| 100 |
int |
| 101 |
gmtval( /* convert GMT date line to UTC */ |
| 102 |
time_t *tloc, |
| 103 |
const char *s |
| 104 |
) |
| 105 |
{ |
| 106 |
struct tm tms; |
| 107 |
const char *cp = GMTSTR; |
| 108 |
|
| 109 |
while (*cp) if (*cp++ != *s++) return(0); |
| 110 |
while (isspace(*s)) s++; |
| 111 |
if (!*s) return(0); |
| 112 |
if (sscanf(s, "%d:%d:%d %d:%d:%d", |
| 113 |
&tms.tm_year, &tms.tm_mon, &tms.tm_mday, |
| 114 |
&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6) |
| 115 |
return(0); |
| 116 |
if (tloc == NULL) |
| 117 |
return(1); |
| 118 |
tms.tm_mon--; |
| 119 |
tms.tm_year -= 1900; |
| 120 |
*tloc = timegm(&tms); |
| 121 |
return(1); |
| 122 |
} |
| 123 |
|
| 124 |
|
| 125 |
void |
| 126 |
fputdate( /* write out the given time value (local & GMT) */ |
| 127 |
time_t tv, |
| 128 |
FILE *fp |
| 129 |
) |
| 130 |
{ |
| 131 |
struct tm *tms; |
| 132 |
|
| 133 |
tms = localtime(&tv); |
| 134 |
if (tms != NULL) |
| 135 |
fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR, |
| 136 |
tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday, |
| 137 |
tms->tm_hour, tms->tm_min, tms->tm_sec); |
| 138 |
tms = gmtime(&tv); |
| 139 |
if (tms != NULL) |
| 140 |
fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", GMTSTR, |
| 141 |
tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday, |
| 142 |
tms->tm_hour, tms->tm_min, tms->tm_sec); |
| 143 |
} |
| 144 |
|
| 145 |
|
| 146 |
void |
| 147 |
fputnow( /* write out the current time */ |
| 148 |
FILE *fp |
| 149 |
) |
| 150 |
{ |
| 151 |
time_t tv; |
| 152 |
time(&tv); |
| 153 |
fputdate(tv, fp); |
| 154 |
} |
| 155 |
|
| 156 |
|
| 157 |
void |
| 158 |
printargs( /* print arguments to a file */ |
| 159 |
int ac, |
| 160 |
char **av, |
| 161 |
FILE *fp |
| 162 |
) |
| 163 |
{ |
| 164 |
while (ac-- > 0) { |
| 165 |
fputword(*av++, fp); |
| 166 |
fputc(ac ? ' ' : '\n', fp); |
| 167 |
} |
| 168 |
} |
| 169 |
|
| 170 |
|
| 171 |
int |
| 172 |
formatval( /* get format value (return true if format) */ |
| 173 |
char *r, |
| 174 |
const char *s |
| 175 |
) |
| 176 |
{ |
| 177 |
const char *cp = FMTSTR; |
| 178 |
|
| 179 |
while (*cp) if (*cp++ != *s++) return(0); |
| 180 |
while (isspace(*s)) s++; |
| 181 |
if (!*s) return(0); |
| 182 |
if (r == NULL) return(1); |
| 183 |
do |
| 184 |
*r++ = *s++; |
| 185 |
while (*s && !isspace(*s)); |
| 186 |
*r = '\0'; |
| 187 |
return(1); |
| 188 |
} |
| 189 |
|
| 190 |
|
| 191 |
void |
| 192 |
fputformat( /* put out a format value */ |
| 193 |
const char *s, |
| 194 |
FILE *fp |
| 195 |
) |
| 196 |
{ |
| 197 |
fputs(FMTSTR, fp); |
| 198 |
fputs(s, fp); |
| 199 |
putc('\n', fp); |
| 200 |
} |
| 201 |
|
| 202 |
|
| 203 |
int |
| 204 |
getheader( /* get header from file */ |
| 205 |
FILE *fp, |
| 206 |
gethfunc *f, |
| 207 |
void *p |
| 208 |
) |
| 209 |
{ |
| 210 |
int rtotal = 0; |
| 211 |
char buf[MAXLINE]; |
| 212 |
|
| 213 |
for ( ; ; ) { |
| 214 |
int rval = 0; |
| 215 |
buf[MAXLINE-2] = '\n'; |
| 216 |
if (fgets(buf, MAXLINE, fp) == NULL) |
| 217 |
return(-1); |
| 218 |
if (buf[buf[0]=='\r'] == '\n') |
| 219 |
return(rtotal); |
| 220 |
if (buf[MAXLINE-2] != '\n') { |
| 221 |
ungetc(buf[MAXLINE-2], fp); /* prevent false end */ |
| 222 |
buf[MAXLINE-2] = '\0'; |
| 223 |
} |
| 224 |
if (f != NULL && (rval = (*f)(buf, p)) < 0) |
| 225 |
return(-1); |
| 226 |
rtotal += rval; |
| 227 |
} |
| 228 |
} |
| 229 |
|
| 230 |
|
| 231 |
struct check { |
| 232 |
FILE *fp; |
| 233 |
char fs[64]; |
| 234 |
}; |
| 235 |
|
| 236 |
|
| 237 |
static int |
| 238 |
mycheck( /* check a header line for format info. */ |
| 239 |
char *s, |
| 240 |
void *cp |
| 241 |
) |
| 242 |
{ |
| 243 |
if (!formatval(((struct check*)cp)->fs, s) |
| 244 |
&& ((struct check*)cp)->fp != NULL) { |
| 245 |
fputs(s, ((struct check*)cp)->fp); |
| 246 |
} |
| 247 |
return(0); |
| 248 |
} |
| 249 |
|
| 250 |
|
| 251 |
int |
| 252 |
globmatch( /* check for match of s against pattern p */ |
| 253 |
const char *p, |
| 254 |
const char *s |
| 255 |
) |
| 256 |
{ |
| 257 |
int setmatch; |
| 258 |
|
| 259 |
do { |
| 260 |
switch (*p) { |
| 261 |
case '?': /* match any character */ |
| 262 |
if (!*s++) |
| 263 |
return(0); |
| 264 |
break; |
| 265 |
case '*': /* match any string */ |
| 266 |
while (p[1] == '*') p++; |
| 267 |
do |
| 268 |
if ( (p[1]=='?') | (p[1]==*s) && |
| 269 |
globmatch(p+1,s) ) |
| 270 |
return(1); |
| 271 |
while (*s++); |
| 272 |
return(0); |
| 273 |
case '[': /* character set */ |
| 274 |
setmatch = *s == *++p; |
| 275 |
if (!*p) |
| 276 |
return(0); |
| 277 |
while (*++p != ']') { |
| 278 |
if (!*p) |
| 279 |
return(0); |
| 280 |
if (*p == '-') { |
| 281 |
setmatch += (p[-1] <= *s && *s <= p[1]); |
| 282 |
if (!*++p) |
| 283 |
break; |
| 284 |
} else |
| 285 |
setmatch += (*p == *s); |
| 286 |
} |
| 287 |
if (!setmatch) |
| 288 |
return(0); |
| 289 |
s++; |
| 290 |
break; |
| 291 |
case '\\': /* literal next */ |
| 292 |
p++; |
| 293 |
/* fall through */ |
| 294 |
default: /* normal character */ |
| 295 |
if (*p != *s) |
| 296 |
return(0); |
| 297 |
s++; |
| 298 |
break; |
| 299 |
} |
| 300 |
} while (*p++); |
| 301 |
return(1); |
| 302 |
} |
| 303 |
|
| 304 |
|
| 305 |
/* |
| 306 |
* Checkheader(fin,fmt,fout) returns a value of 1 if the input format |
| 307 |
* matches the specification in fmt, 0 if no input format was found, |
| 308 |
* and -1 if the input format does not match or there is an |
| 309 |
* error reading the header. If fmt is empty, then -1 is returned |
| 310 |
* if any input format is found (or there is an error), and 0 otherwise. |
| 311 |
* If fmt contains any '*' or '?' characters, then checkheader |
| 312 |
* does wildcard expansion and copies a matching result into fmt. |
| 313 |
* Be sure that fmt is big enough to hold the match in such cases, |
| 314 |
* and that it is not a static, read-only string! |
| 315 |
* The input header (minus any format lines) is copied to fout |
| 316 |
* if fout is not NULL. |
| 317 |
*/ |
| 318 |
|
| 319 |
int |
| 320 |
checkheader( |
| 321 |
FILE *fin, |
| 322 |
char *fmt, |
| 323 |
FILE *fout |
| 324 |
) |
| 325 |
{ |
| 326 |
struct check cdat; |
| 327 |
char *cp; |
| 328 |
|
| 329 |
cdat.fp = fout; |
| 330 |
cdat.fs[0] = '\0'; |
| 331 |
if (getheader(fin, mycheck, &cdat) < 0) |
| 332 |
return(-1); |
| 333 |
if (!cdat.fs[0]) |
| 334 |
return(0); |
| 335 |
for (cp = fmt; *cp; cp++) /* check for globbing */ |
| 336 |
if ((*cp == '?') | (*cp == '*')) { |
| 337 |
if (globmatch(fmt, cdat.fs)) { |
| 338 |
strcpy(fmt, cdat.fs); |
| 339 |
return(1); |
| 340 |
} else |
| 341 |
return(-1); |
| 342 |
} |
| 343 |
return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */ |
| 344 |
} |
