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boinc/lib/parse.C

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// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// A very crude interface for parsing XML files;
// assumes all elements are either single-line or
// have start and end tags on separate lines.
// This is meant to be used ONLY for parsing XML files produced
// by the BOINC scheduling server or client.
// Could replace this with a more general parser.
#ifdef _WIN32
#include "boinc_win.h"
#endif
#ifndef _WIN32
#include <cstring>
#include <cstdlib>
#include <string>
#endif
#include "error_numbers.h"
#include "util.h"
#include "parse.h"
#ifdef _USING_FCGI_
#include "fcgi_stdio.h"
#endif
using std::string;
// return true if the tag appears in the line
//
bool match_tag(const char* buf, const char* tag) {
if (strstr(buf, tag)) return true;
return false;
}
bool match_tag(const std::string &s, const char* tag) {
return match_tag(s.c_str(), tag);
}
// parse an integer of the form <tag>1234</tag>
// return true if it's there
// Note: this doesn't check for the end tag
//
bool parse_int(const char* buf, const char* tag, int& x) {
char* p = strstr(buf, tag);
if (!p) return false;
x = strtol(p+strlen(tag), 0, 0); // this parses 0xabcd correctly
return true;
}
// Same, for doubles
//
bool parse_double(const char* buf, const char* tag, double& x) {
char* p = strstr(buf, tag);
if (!p) return false;
x = atof(p+strlen(tag));
return true;
}
// parse a string of the form ...<tag attrs>string</tag>...;
// returns the "string" part.
// Does XML unescaping (replace &lt; with <)
// "string" may not include '<'
// Strips white space from ends.
// Use "<tag", not "<tag>", if there might be attributes
//
bool parse_str(const char* buf, const char* tag, string& dest) {
string str;
char const* p;
// sanity check on NULL and empty cases.
if (!buf || !tag || !strlen(tag))
return false;
p = strstr(buf, tag);
if (!p) return false;
p = strchr(p, '>');
++p;
char const* q = strchr(p, '<');
if (!q) return false;
str.assign(p, q-p);
strip_whitespace(str);
xml_unescape(str, dest);
return true;
}
bool parse_str(const char* buf, const char* tag, char* dest, int len) {
string str;
if (!parse_str(buf, tag, str)) return false;
safe_strncpy(dest, str.c_str(), len);
return true;
}
// parse a string of the form name="string";
// returns string in dest
//
void parse_attr(const char* buf, const char* name, char* dest, int len) {
char* p, *q;
strcpy(dest, "");
p = strstr(buf, name);
if (!p) return;
p = strchr(p, '"');
if (!p) return;
q = strchr(p+1, '"');
if (!q) return;
if (len > q-p) len = (int)(q-p);
safe_strncpy(dest, p+1, len);
}
void copy_stream(FILE* in, FILE* out) {
char buf[1024];
int n, m;
while (1) {
n = (int)fread(buf, 1, 1024, in);
m = (int)fwrite(buf, 1, n, out);
if (n < 1024) break;
}
}
// append to a malloc'd string
//
void strcatdup(char*& p, char* buf) {
p = (char*)realloc(p, strlen(p) + strlen(buf)+1);
if (!p) {
fprintf(stderr, "strcatdup: realloc failed\n");
exit(1);
}
strcat(p, buf);
}
// copy from a file to a malloc'd string until the end tag is reached
//
int dup_element_contents(FILE* in, const char* end_tag, char** pp) {
char buf[256];
char* p = strdup("");
while (fgets(buf, 256, in)) {
if (strstr(buf, end_tag)) {
*pp = p;
return 0;
}
strcatdup(p, buf);
}
fprintf(stderr, "dup_element_contents(): no end tag\n");
return ERR_XML_PARSE;
}
// copy from a file to static buffer
//
int copy_element_contents(FILE* in, const char* end_tag, char* p, int len) {
char buf[256];
int n;
strcpy(p, "");
while (fgets(buf, 256, in)) {
if (strstr(buf, end_tag)) {
return 0;
}
n = (int)strlen(buf);
if (n >= len-1) return ERR_XML_PARSE;
strcat(p, buf);
len -= n;
}
fprintf(stderr, "copy_element_contents(): no end tag\n");
return ERR_XML_PARSE;
}
int copy_element_contents(FILE* in, const char* end_tag, string& str) {
char buf[256];
str = "";
while (fgets(buf, 256, in)) {
if (strstr(buf, end_tag)) {
return 0;
}
str += buf;
}
fprintf(stderr, "copy_element_contents(): no end tag\n");
return ERR_XML_PARSE;
}
// read a file into a malloc'd string
//
int read_file_malloc(const char* pathname, char*& str) {
char buf[256];
FILE* f;
f = fopen(pathname, "r");
if (!f) return ERR_FOPEN;
str = strdup("");
while (fgets(buf, 256, f)) {
strcatdup(str, buf);
}
fclose(f);
return 0;
}
// replace XML element contents (element must be present)
//
void replace_element_contents(
char* buf, char* start, char* end, char* replacement
) {
char temp[4096], *p, *q;
p = strstr(buf, start);
p += strlen(start);
q = strstr(p, end);
safe_strncpy(temp, q, sizeof(temp));
strcpy(p, replacement);
strcat(p, temp);
}
// if the string contains a substring of the form X...Y,
// remove the first such.
bool remove_element(char* buf, char* start, char* end) {
char* p, *q;
p = strstr(buf, start);
if (!p) return false;
q = strstr(p+strlen(start), end);
if (!q) return false;
strcpy(p, q+strlen(end));
return true;
}
// replace a substring. Do at most one instance.
//
bool str_replace(char* str, char* substr, char* replacement) {
char temp[4096], *p;
p = strstr(str, substr);
if (!p) return false;
int n = (int)strlen(substr);
strcpy(temp, p+n);
strcpy(p, replacement);
strcat(p, temp);
return true;
}
// if the given XML has an element of the form
// <venue name="venue_name">
// ...
// </venue>
// then return the contents of that element.
// Otherwise strip out all <venue> elements
//
void extract_venue(char* in, char* venue_name, char* out) {
char* p, *q;
char buf[256];
sprintf(buf, "<venue name=\"%s\">", venue_name);
p = strstr(in, buf);
if (p) {
p += strlen(buf);
strcpy(out, p);
q = strstr(out, "</venue");
if (q) *q = 0;
} else {
strcpy(out, in);
while (1) {
p = strstr(out, "<venue");
if (!p) break;
q = strstr(p, "</venue>\n");
if (!q) break;
strcpy(p, q+strlen("</venue>\n"));
}
}
}
// copy a line from the given string.
// kinda like fgets() when you're reading from a string
//
char* sgets(char* buf, int len, char*& in) {
char* p;
p = strstr(in, "\n");
if (!p) return NULL;
*p = 0;
safe_strncpy(buf, in, len);
*p = '\n';
in = p+1;
return buf;
}
void xml_escape(string& in, string& out) {
int i;
char buf[256];
out = "";
for (i=0; i<(int)in.length(); i++) {
int x = (int) in[i];
x &= 0xff; // just in case
if (in[i] == '<') {
out += "&lt;";
} else if (in[i] == '&') {
out += "&amp;";
} else if (x>127) {
sprintf(buf, "&#%d;", x);
out += buf;
} else if (x<32) {
switch(x) {
case 9:
case 10:
case 13:
sprintf(buf, "&#%d;", x);
out += buf;
break;
}
} else {
out += in[i];
}
}
}
void xml_escape(char* in, string& out) {
string foo = in;
xml_escape(foo, out);
}
void xml_unescape(string& in, string& out) {
int i;
out = "";
for (i=0; i<(int)in.length(); i++) {
if (in.substr(i, 4) == "&lt;") {
out += "<";
i += 3;
} else if (in.substr(i, 5) == "&amp;") {
out += "&";
i += 4;
} else if (in.substr(i, 2) == "&#") {
char c = atoi(in.substr(i+2, 3).c_str());
out += c;
} else {
out += in[i];
}
}
}
const char *BOINC_RCSID_3f3de9eb18 = "$Id$";
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