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freeswitch/libs/xmlrpc-c/src/parse_datetime.c

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#include "xmlrpc_config.h"
#include <stdlib.h>
#include <assert.h>
#include <ctype.h>
#include <string.h>
#if HAVE_REGEX
#include <sys/types.h> /* Missing from regex.h in GNU libc */
#include <regex.h>
#endif
#include "bool.h"
#include "xmlrpc-c/base.h"
#include "xmlrpc-c/base_int.h"
#include "xmlrpc-c/util.h"
#include "parse_datetime.h"
#if HAVE_REGEX
static unsigned int
digitStringValue(const char * const string,
regmatch_t const match) {
/*----------------------------------------------------------------------------
Return the numerical value of the decimal whole number substring of
'string' identified by 'match'. E.g. if 'string' is 'abc34d' and
'match' says start at 3 and end at 5, we return 34.
-----------------------------------------------------------------------------*/
unsigned int i;
unsigned int accum;
assert(match.rm_so >= 0);
assert(match.rm_eo >= 0);
for (i = match.rm_so, accum = 0; i < (unsigned)match.rm_eo; ++i) {
accum *= 10;
assert(isdigit(string[i]));
accum += string[i] - '0';
}
return accum;
}
#endif /* HAVE_REGEX */
#if HAVE_REGEX
static unsigned int
digitStringMillionths(const char * const string,
regmatch_t const match) {
/*----------------------------------------------------------------------------
Return the number of millionths represented by the digits after the
decimal point in a decimal string, where thse digits are the substring
of 'string' identified by 'match'. E.g. if the substring is
34, we return 340,000.
-----------------------------------------------------------------------------*/
unsigned int i;
unsigned int accum;
assert(match.rm_so >= 0);
assert(match.rm_eo >= 0);
for (i = match.rm_so, accum = 0; i < (unsigned)match.rm_so+6; ++i) {
accum *= 10;
if (i < (unsigned)match.rm_eo) {
assert(isdigit(string[i]));
accum += string[i] - '0';
}
}
return accum;
}
#endif /* HAVE_REGEX */
#if HAVE_REGEX
static void
subParseDtRegex_standard(regmatch_t * const matches,
const char * const datetimeString,
xmlrpc_datetime * const dtP) {
dtP->Y = digitStringValue(datetimeString, matches[1]);
dtP->M = digitStringValue(datetimeString, matches[2]);
dtP->D = digitStringValue(datetimeString, matches[3]);
dtP->h = digitStringValue(datetimeString, matches[4]);
dtP->m = digitStringValue(datetimeString, matches[5]);
dtP->s = digitStringValue(datetimeString, matches[6]);
if (matches[7].rm_so == -1)
dtP->u = 0;
else
dtP->u = digitStringMillionths(datetimeString, matches[7]);
}
static void
subParseDtRegex_standardtzd(regmatch_t * const matches,
const char * const datetimeString,
xmlrpc_datetime * const dtP) {
dtP->Y = digitStringValue(datetimeString, matches[1]);
dtP->M = digitStringValue(datetimeString, matches[2]);
dtP->D = digitStringValue(datetimeString, matches[3]);
dtP->h = digitStringValue(datetimeString, matches[4]);
dtP->m = digitStringValue(datetimeString, matches[5]);
dtP->s = digitStringValue(datetimeString, matches[6]);
}
#endif /* HAVE_REGEX */
#if HAVE_REGEX
typedef void (*regparsefunc_t)(regmatch_t * const matches,
const char * const datetimeString,
xmlrpc_datetime * const dtP);
struct regexParser {
const char * const regex;
regparsefunc_t func;
};
static const struct regexParser iso8601Regex[]
/* Each entry of this table is instructions for recognizing and parsing
some form of a "dateTime.iso8601" XML element.
(Note that we recognize far more than just the XML-RPC standard
dateTime.iso8601).
*/
= {
{
/* Examples:
YYYYMMDD[T]HHMMSS
YYYY-MM-DD[T]HH:MM:SS
YYYY-MM-DD[T]HH:MM:SS.ssss
*/
"^([0-9]{4})\\-?([0-9]{2})\\-?([0-9]{2})T"
"([0-9]{2}):?([0-9]{2}):?([0-9]{2})\\.?([0-9]+)?$",
subParseDtRegex_standard
},
{
/* Examples:
YYYYMMDD[T]HHMMSS[Z]
YYYYMMDD[T]HHMMSS[+-]hh
YYYYMMDD[T]HHMMSS[+-]hhmm
*/
"^([0-9]{4})\\-?([0-9]{2})\\-?([0-9]{2})T"
"([0-9]{2}):?([0-9]{2}):?([0-9]{2})[Z\\+\\-]([0-9]{2,4})?$",
subParseDtRegex_standardtzd
},
{ NULL, NULL }
};
#endif /* HAVE_REGEX */
#if HAVE_REGEX
static void
parseDtRegex(xmlrpc_env * const envP,
const char * const datetimeString,
xmlrpc_datetime * const dtP) {
unsigned int i;
const struct regexParser * parserP;
/* The parser that matches 'datetimeString'. Null if no match yet
found.
*/
regmatch_t matches[1024];
for (i = 0, parserP = NULL; iso8601Regex[i].regex && !parserP; ++i) {
const struct regexParser * const thisParserP = &iso8601Regex[i];
regex_t re;
int status;
status = regcomp(&re, thisParserP->regex, REG_ICASE | REG_EXTENDED);
/* Our regex is valid, so it must have compiled: */
assert(status == 0);
{
int status;
status = regexec(&re, datetimeString, ARRAY_SIZE(matches),
matches, 0);
if (status == 0) {
assert(matches[0].rm_so != -1); /* Match of whole regex */
parserP = thisParserP;
}
regfree(&re);
}
}
if (parserP) {
parserP->func(matches, datetimeString, dtP);
} else {
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"value '%s' is not of any form we recognize "
"for a <dateTime.iso8601> element",
datetimeString);
}
}
#endif /* HAVE_REGEX */
static __inline__ void
parseDtNoRegex(xmlrpc_env * const envP,
const char * const datetimeString,
xmlrpc_datetime * const dtP) {
unsigned int const dtStrlen = strlen(datetimeString);
char year[4+1];
char month[2+1];
char day[2+1];
char hour[2+1];
char minute[2+1];
char second[2+1];
if (dtStrlen < 17 || dtStrlen == 18 || dtStrlen > 24)
xmlrpc_faultf(envP, "could not parse date, size incompatible: '%d'",
dtStrlen);
else {
year[0] = datetimeString[ 0];
year[1] = datetimeString[ 1];
year[2] = datetimeString[ 2];
year[3] = datetimeString[ 3];
year[4] = '\0';
month[0] = datetimeString[ 4];
month[1] = datetimeString[ 5];
month[2] = '\0';
day[0] = datetimeString[ 6];
day[1] = datetimeString[ 7];
day[2] = '\0';
assert(datetimeString[ 8] == 'T');
hour[0] = datetimeString[ 9];
hour[1] = datetimeString[10];
hour[2] = '\0';
assert(datetimeString[11] == ':');
minute[0] = datetimeString[12];
minute[1] = datetimeString[13];
minute[2] = '\0';
assert(datetimeString[14] == ':');
second[0] = datetimeString[15];
second[1] = datetimeString[16];
second[2] = '\0';
if (dtStrlen > 17) {
unsigned int const pad = 24 - dtStrlen;
unsigned int i;
dtP->u = atoi(&datetimeString[18]);
for (i = 0; i < pad; ++i)
dtP->u *= 10;
} else
dtP->u = 0;
dtP->Y = atoi(year);
dtP->M = atoi(month);
dtP->D = atoi(day);
dtP->h = atoi(hour);
dtP->m = atoi(minute);
dtP->s = atoi(second);
}
}
static void
validateFirst17(xmlrpc_env * const envP,
const char * const dt) {
/*----------------------------------------------------------------------------
Assuming 'dt' is at least 17 characters long, validate that the first
17 characters are a valid XML-RPC datetime, e.g.
"20080628T16:35:02"
-----------------------------------------------------------------------------*/
unsigned int i;
for (i = 0; i < 8 && !envP->fault_occurred; ++i)
if (!isdigit(dt[i]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[i]);
if (dt[8] != 'T')
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "9th character is '%c', not 'T'",
dt[8]);
if (!isdigit(dt[9]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[9]);
if (!isdigit(dt[10]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[10]);
if (dt[11] != ':')
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a colon: '%c'", dt[11]);
if (!isdigit(dt[12]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[12]);
if (!isdigit(dt[13]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[13]);
if (dt[14] != ':')
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a colon: '%c'", dt[14]);
if (!isdigit(dt[15]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[15]);
if (!isdigit(dt[16]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Not a digit: '%c'", dt[16]);
}
static void
validateFractionalSeconds(xmlrpc_env * const envP,
const char * const dt) {
/*----------------------------------------------------------------------------
Validate the fractional seconds part of the XML-RPC datetime string
'dt', if any. That's the decimal point and everything following
it.
-----------------------------------------------------------------------------*/
if (strlen(dt) > 17) {
if (dt[17] != '.') {
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"'%c' where only a period is valid", dt[17]);
} else {
if (dt[18] == '\0')
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR, "Nothing after decimal point");
else {
unsigned int i;
for (i = 18; dt[i] != '\0' && !envP->fault_occurred; ++i) {
if (!isdigit(dt[i]))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Non-digit in fractional seconds: '%c'", dt[i]);
}
}
}
}
}
static __inline__ void
validateFormatNoRegex(xmlrpc_env * const envP,
const char * const dt) {
if (strlen(dt) < 17)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Invalid length of %u of datetime. "
"Must be at least 17 characters",
(unsigned)strlen(dt));
else {
validateFirst17(envP, dt);
validateFractionalSeconds(envP, dt);
}
}
static void
validateXmlrpcDatetimeSome(xmlrpc_env * const envP,
xmlrpc_datetime const dt) {
/*----------------------------------------------------------------------------
Type xmlrpc_datetime is defined such that it can represent a nonexistent
datetime such as February 30.
Validate that 'dt' doesn't have glaring invalidities such as Hour 25.
We leave the possibility of more subtle invalidity such as February 30.
-----------------------------------------------------------------------------*/
if (dt.M < 1 || dt.M > 12)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Month of year value %u is not in the range 1-12", dt.M);
else if (dt.D < 1 || dt.D > 31)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Day of month value %u is not in the range 1-31", dt.D);
else if (dt.h > 23)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Hour of day value %u is not in the range 0-23", dt.h);
else if (dt.m > 59)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Minute of hour value %u is not in the range 0-59", dt.m);
else if (dt.s > 59)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Second of minute value %u is not in the range 0-59", dt.s);
else if (dt.u > 999999)
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_PARSE_ERROR,
"Microsecond of second value %u is not in the range 0-1M", dt.u);
}
void
xmlrpc_parseDatetime(xmlrpc_env * const envP,
const char * const datetimeString,
xmlrpc_value ** const valuePP) {
/*----------------------------------------------------------------------------
Parse the content of a <datetime.iso8601> XML-RPC XML element, e.g.
"20000301T00:00:00".
'str' is that content.
Example of the format we parse: "19980717T14:08:55"
Note that this is not quite ISO 8601. It's a bizarre combination of
two ISO 8601 formats.
Note that Xmlrpc-c recognizes various extensions of the XML-RPC
<datetime.iso8601> element type.
'str' may not be valid XML-RPC (with extensions). In that case we fail
with fault code XMLRPC_PARSE_ERROR.
-----------------------------------------------------------------------------*/
xmlrpc_datetime dt;
#if HAVE_REGEX
parseDtRegex(envP, datetimeString, &dt);
#else
/* Note: validation is not as strong without regex */
validateFormatNoRegex(envP, datetimeString);
if (!envP->fault_occurred)
parseDtNoRegex(envP, datetimeString, &dt);
#endif
if (!envP->fault_occurred) {
validateXmlrpcDatetimeSome(envP, dt);
if (!envP->fault_occurred)
*valuePP = xmlrpc_datetime_new(envP, dt);
}
}
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