mirror of https://github.com/BOINC/boinc.git
264 lines
6.6 KiB
C
264 lines
6.6 KiB
C
// The contents of this file are subject to the BOINC Public License
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// Version 1.0 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License at
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// http://boinc.berkeley.edu/license_1.0.txt
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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// License for the specific language governing rights and limitations
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// under the License.
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//
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// The Original Code is the Berkeley Open Infrastructure for Network Computing.
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//
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// The Initial Developer of the Original Code is the SETI@home project.
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// Portions created by the SETI@home project are Copyright (C) 2002
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// University of California at Berkeley. All Rights Reserved.
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//
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// Contributor(s):
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//
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// A very crude interface for parsing XML files;
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// assumes all elements are either single-line or
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// have start and end tags on separate lines.
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// This is meant to be used ONLY for parsing XML files produced
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// by the BOINC scheduling server or client.
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// Could replace this with a more general parser.
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#ifdef _WIN32
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#include <afxwin.h>
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#endif
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#include <string.h>
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#include <stdlib.h>
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#include <string>
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#include "error_numbers.h"
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#include "util.h"
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#include "parse.h"
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// return true if the tag appears in the line
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//
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bool match_tag(const char* buf, const char* tag) {
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if (strstr(buf, tag)) return true;
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return false;
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}
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bool match_tag(const std::string &s, const char* tag) {
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if (s.find(tag) != std::string::npos) return true;
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return false;
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}
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// parse an integer of the form <tag>1234</tag>
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// return true if it's there
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// Note: this doesn't check for the end tag
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//
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bool parse_int(const char* buf, const char* tag, int& x) {
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char* p = strstr(buf, tag);
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if (!p) return false;
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x = strtol(p+strlen(tag), 0, 0); // this parses 0xabcd correctly
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return true;
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}
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// Same, for doubles
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//
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bool parse_double(const char* buf, const char* tag, double& x) {
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char* p = strstr(buf, tag);
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if (!p) return false;
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x = atof(p+strlen(tag));
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return true;
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}
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// parse a string of the form <tag>string</tag>
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//
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bool parse_str(const char* buf, const char* tag, char* dest, int len) {
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char* p = strstr(buf, tag);
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if (!p) return false;
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p = strchr(p, '>');
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char* q = strchr(p+1, '<');
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if (!q) return false;
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*q = 0;
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safe_strncpy(dest, p+1, len);
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*q = '<';
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return true;
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}
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// parse a string of the form name="string"
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//
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void parse_attr(const char* buf, const char* name, char* dest, int len) {
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char* p, *q;
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strcpy(dest, "");
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p = strstr(buf, name);
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if (!p) return;
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p = strchr(p, '"');
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if (!p) return;
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q = strchr(p+1, '"');
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if (!q) return;
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*q = 0;
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safe_strncpy(dest, p+1, len);
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}
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void copy_stream(FILE* in, FILE* out) {
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char buf[1024];
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int n, m;
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while (1) {
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n = fread(buf, 1, 1024, in);
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m = fwrite(buf, 1, n, out);
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if (n < 1024) break;
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}
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}
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// append to a malloc'd string
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//
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void strcatdup(char*& p, char* buf) {
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p = (char*)realloc(p, strlen(p) + strlen(buf)+1);
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if (!p) {
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fprintf(stderr, "strcatdup: realloc failed\n");
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exit(1);
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}
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strcat(p, buf);
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}
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// copy from a file to a malloc'd string until the end tag is reached
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//
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int dup_element_contents(FILE* in, const char* end_tag, char** pp) {
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char buf[256];
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char* p = strdup("");
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while (fgets(buf, 256, in)) {
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if (strstr(buf, end_tag)) {
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*pp = p;
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return 0;
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}
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strcatdup(p, buf);
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}
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fprintf(stderr, "dup_element_contents(): no end tag\n");
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return 1;
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}
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// copy from a file to static buffer
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//
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int copy_element_contents(FILE* in, const char* end_tag, char* p, int len) {
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char buf[256];
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strcpy(p, "");
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while (fgets(buf, 256, in)) {
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if (strstr(buf, end_tag)) {
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return 0;
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}
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strcat(p, buf);
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}
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fprintf(stderr, "copy_element_contents(): no end tag\n");
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return 1;
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}
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// read a file into a malloc'd string
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//
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int read_file_malloc(const char* pathname, char*& str) {
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char buf[256];
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FILE* f;
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f = fopen(pathname, "r");
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if (!f) return -1;
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str = strdup("");
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while (fgets(buf, 256, f)) {
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strcatdup(str, buf);
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}
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fclose(f);
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return 0;
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}
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// replace XML element contents. not currently used
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//
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void replace_element(char* buf, char* start, char* end, char* replacement) {
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char temp[4096], *p, *q;
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p = strstr(buf, start);
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p += strlen(start);
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q = strstr(p, end);
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safe_strncpy(temp, q, sizeof(temp));
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strcpy(p, replacement);
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strcat(p, temp);
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}
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// if the given XML has an element of the form
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// <venue name="venue_name">
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// ...
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// </venue>
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// then return the contents of that element.
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// Otherwise strip out all <venue> elements
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//
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void extract_venue(const char* in, const char* venue_name, char* out) {
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char* p, *q;
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char buf[256];
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sprintf(buf, "<venue name=\"%s\">", venue_name);
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p = strstr(in, buf);
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if (p) {
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p += strlen(buf);
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strcpy(out, p);
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q = strstr(out, "</venue");
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if (q) *q = 0;
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} else {
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strcpy(out, in);
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while (1) {
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p = strstr(out, "<venue");
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if (!p) break;
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q = strstr(p, "</venue>\n");
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if (!q) break;
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strcpy(p, q+strlen("</venue>\n"));
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}
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}
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}
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// copy a line from the given string.
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// kinda like fgets() when you're reading from a string
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//
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char* sgets(char* buf, int len, char*& in) {
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char* p;
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p = strstr(in, "\n");
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if (!p) return NULL;
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*p = 0;
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safe_strncpy(buf, in, len);
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*p = '\n';
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in = p+1;
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return buf;
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}
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bool extract_xml_record(const std::string &field, const char *tag, std::string &record) {
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std::string::size_type start_pos,end_pos,m;
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char end_tag[256];
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sprintf(end_tag,"/%s",tag);
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std::string::size_type i=0,j=0;
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// find the end tag
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do {
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j=field.find(">",j+1);
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end_pos=field.rfind(end_tag,j,j-i+1);
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i=field.rfind("<",j,j-i);
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} while ((end_pos==std::string::npos) && (j!=std::string::npos));
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if (j!=std::string::npos) {
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end_pos=j;
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} else {
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return false;
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}
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// find the start tag
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j--; i=0;
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do {
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j=field.rfind(">",j-1);
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start_pos=field.rfind(tag,j,j-i+1);
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i=field.rfind("<",j,j-i+1);
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m=field.rfind("/",j,j-i+1);
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} while (((m!=std::string::npos) || (start_pos==std::string::npos)) && (i!=std::string::npos));
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if (i!=std::string::npos) {
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start_pos=i;
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} else {
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return false;
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}
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record=std::string(field,start_pos,end_pos-start_pos+1);
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return true;
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}
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