fc0b771cdf
the node cache prevents recursively walking the xml tree over and over
again to find the specified nodes.
442 lines
11 KiB
C
442 lines
11 KiB
C
#include <stdio.h>
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <string.h>
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#ifndef _MSC_VER
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# include <strings.h>
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# include <unistd.h> /* read */
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#else
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# define strncasecmp strnicmp
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# include <stdlib.h>
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# include <io.h>
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#endif
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#include <assert.h>
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#include <sys/stat.h> /* fstat */
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#include <fcntl.h> /* open */
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#include "xml.h"
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static const char *_static_root = "/";
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static const char *_static_element = "*";
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static unsigned int _fcount = 0;
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static char **_filenames = 0;
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static char *_element = 0;
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static char *_value = 0;
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static char *_root = 0;
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static char *_print = 0;
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static char *_attribute = 0;
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static int print_filenames = 0;
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static void free_and_exit(int i);
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#define USE_BUFFER 0
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#define NODE_NAME_LEN 256
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#define STRING_LEN 2048
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#define SHOW_NOVAL(opt) \
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{ \
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printf("option '%s' requires a value\n\n", (opt)); \
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free_and_exit(-1); \
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}
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void
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show_help ()
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{
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printf("usage: xmlgrep [options] [file ...]\n\n");
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printf("Options:\n");
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printf("\t-h\t\tshow this help message\n");
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printf("\t-a <string>\tprint this attribute as the output\n");
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printf("\t-e <id>\t\tshow sections that contain this element\n");
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printf("\t-p <id>\t\tprint this element as the output\n");
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printf("\t-r <path>\tspecify the XML search root\n");
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printf("\t-v <string>\tfilter sections that contain this vale\n\n");
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printf(" To print the contents of the 'type' element of the XML section ");
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printf("that begins\n at '/printer/output' use the following command:\n\n");
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printf("\txmlgrep -r /printer/output -p type sample.xml\n\n");
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printf(" To filter 'output' elements under '/printer' that have attribute");
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printf(" 'n' set to '1'\n use the following command:\n\n");
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printf("\txmlgrep -r /printer -p output -a n -v 1 sample.xml\n\n");
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printf(" To filter out sections that contain the 'driver' element with ");
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printf("'generic' as\n it's value use the following command:");
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printf("\n\n\txmlgrep -r /printer/output -e driver -v generic sample.xml");
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printf("\n\n");
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free_and_exit(0);
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}
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void
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free_and_exit(int ret)
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{
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if (_root && _root != _static_root) free(_root);
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if (_element && _element != _static_element) free(_element);
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if (_value) free(_value);
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if (_print) free(_print);
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if (_attribute) free(_attribute);
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if (_filenames)
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{
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unsigned int i;
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for (i=0; i < _fcount; i++)
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{
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if (_filenames[i])
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{
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if (print_filenames) printf("%s\n", _filenames[i]);
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free(_filenames[i]);
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}
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}
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free(_filenames);
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}
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exit(ret);
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}
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int
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parse_option(char **args, int n, int max)
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{
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char *opt, *arg = 0;
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unsigned int alen = 0;
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unsigned int olen;
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opt = args[n];
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if (strncmp(opt, "--", 2) == 0)
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opt++;
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if ((arg = strchr(opt, '=')) != NULL)
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{
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*arg++ = 0;
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}
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else if (++n < max)
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{
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arg = args[n];
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#if 0
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if (arg && arg[0] == '-')
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arg = 0;
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#endif
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}
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olen = strlen(opt);
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if (strncmp(opt, "-help", olen) == 0)
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{
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show_help();
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}
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else if (strncmp(opt, "-root", olen) == 0)
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{
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if (arg == 0) SHOW_NOVAL(opt);
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alen = strlen(arg)+1;
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if (_root) free(_root);
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_root = malloc(alen);
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memcpy(_root, arg, alen);
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return 2;
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}
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else if (strncmp(opt, "-element", olen) == 0)
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{
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if (arg == 0) SHOW_NOVAL(opt);
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alen = strlen(arg)+1;
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if (_element) free(_element);
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_element = malloc(alen);
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memcpy(_element, arg, alen);
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return 2;
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}
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else if (strncmp(opt, "-value", olen) == 0)
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{
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if (arg == 0) SHOW_NOVAL(opt);
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alen = strlen(arg)+1;
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if (_value) free(_value);
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_value = malloc(alen);
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memcpy(_value, arg, alen);
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return 2;
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}
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else if (strncmp(opt, "-print", olen) == 0)
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{
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if (arg == 0) SHOW_NOVAL(opt);
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alen = strlen(arg)+1;
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if (_print) free(_print);
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_print = malloc(alen);
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memcpy(_print, arg, alen);
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return 2;
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}
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else if (strncmp(opt, "-attribute", olen) == 0)
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{
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if (arg == 0) SHOW_NOVAL(opt);
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alen = strlen(arg)+1;
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if (_attribute) free(_attribute);
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_attribute = malloc(alen);
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memcpy(_attribute, arg, alen);
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return 2;
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}
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else if (strncmp(opt, "-list-filenames", olen) == 0)
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{ /* undocumented test argument */
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print_filenames = 1;
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return 1;
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}
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else if (opt[0] == '-')
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{
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printf("Unknown option %s\n", opt);
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free_and_exit(-1);
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}
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else
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{
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int pos = _fcount++;
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if (_filenames == 0)
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{
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_filenames = (char **)malloc(sizeof(char*));
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}
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else
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{
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char **ptr = (char **)realloc(_filenames, _fcount*sizeof(char*));
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if (ptr == 0)
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{
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printf("Out of memory.\n\n");
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free_and_exit(-1);
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}
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_filenames = ptr;
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}
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alen = strlen(opt)+1;
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_filenames[pos] = malloc(alen);
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memcpy(_filenames[pos], opt, alen);
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}
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return 1;
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}
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void walk_the_tree(size_t num, void *xid, char *tree)
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{
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unsigned int i, no_elements;
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if (!tree) /* last node from the tree */
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{
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void *xmid = xmlMarkId(xid);
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if (xmid && _print)
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{
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no_elements = xmlNodeGetNum(xid, _print);
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for (i=0; i<no_elements; i++)
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{
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if (xmlNodeGetPos(xid, xmid, _print, i) != 0)
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{
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char *value;
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value = xmlGetString(xmid);
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if (_value && _attribute && value)
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{
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#if 1
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char *a = xmlAttributeGetString(xmid, _attribute);
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if (a && !strcmp(a, _value))
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#else
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if (!xmlAttributeCompareString(xmid, _attribute, _value))
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#endif
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{
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printf("%s: <%s %s=\"%s\">%s</%s>\n",
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_filenames[num], _print, _attribute, _value,
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value, _print);
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}
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if (value) free(value);
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}
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else
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{
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printf("%s: <%s>%s</%s>\n",
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_filenames[num], _print, value, _print);
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}
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}
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}
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free(xmid);
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}
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else if (xmid && _value)
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{
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no_elements = xmlNodeGetNum(xmid, _element);
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for (i=0; i<no_elements; i++)
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{
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if (xmlNodeGetPos(xid, xmid, _element, i) != 0)
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{
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char nodename[NODE_NAME_LEN];
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xmlNodeCopyName(xmid, (char *)&nodename, NODE_NAME_LEN);
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if (xmlCompareString(xmid, _value) == 0)
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{
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printf("%s: <%s>%s</%s>\n",
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_filenames[num], nodename, _value, nodename);
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}
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}
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}
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free(xmid);
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}
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else if (xmid && _element)
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{
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char parentname[NODE_NAME_LEN];
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xmlNodeCopyName(xid, (char *)&parentname, NODE_NAME_LEN);
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no_elements = xmlNodeGetNum(xmid, _element);
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for (i=0; i<no_elements; i++)
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{
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if (xmlNodeGetPos(xid, xmid, _element, i) != 0)
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{
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char nodename[NODE_NAME_LEN];
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xmlNodeCopyName(xmid, (char *)&nodename, NODE_NAME_LEN);
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if (!strncasecmp((char*)&nodename, _element, NODE_NAME_LEN))
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{
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char value[NODE_NAME_LEN];
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xmlCopyString(xmid, (char *)&value, NODE_NAME_LEN);
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printf("%s: <%s> <%s>%s</%s> </%s>\n",
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_filenames[num], parentname, nodename, value,
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nodename, parentname);
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}
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}
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}
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}
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else printf("Error executing xmlMarkId\n");
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}
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else if (xid) /* walk the rest of the tree */
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{
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char *elem, *next;
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void *xmid;
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elem = tree;
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if (*elem == '/') elem++;
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next = strchr(elem, '/');
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xmid = xmlMarkId(xid);
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if (xmid)
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{
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if (next)
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{
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*next++ = 0;
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}
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no_elements = xmlNodeGetNum(xid, elem);
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for (i=0; i<no_elements; i++)
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{
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if (xmlNodeGetPos(xid, xmid, elem, i) != 0)
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walk_the_tree(num, xmid, next);
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}
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if (next)
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{
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*--next = '/';
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}
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free(xmid);
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}
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else printf("Error executing xmlMarkId\n");
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}
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}
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void grep_file(unsigned num)
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{
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void *xid;
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xid = xmlOpen(_filenames[num]);
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if (xid)
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{
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void *xrid = xmlMarkId(xid);
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int r = 0;
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walk_the_tree(num, xrid, _root);
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r = xmlErrorGetNo(xrid, 0);
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if (r)
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{
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size_t n = xmlErrorGetLineNo(xrid, 0);
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size_t c = xmlErrorGetColumnNo(xrid, 0);
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const char *s = xmlErrorGetString(xrid, 1); /* clear the error */
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printf("%s: at line %u, column %u: '%s'\n",_filenames[num], n,c, s);
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}
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free(xrid);
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}
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else
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{
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fprintf(stderr, "Error reading file '%s'\n", _filenames[num]);
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}
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xmlClose(xid);
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}
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void grep_file_buffer(unsigned num)
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{
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struct stat st;
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void *xid, *buf;
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int fd, res;
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fd = open(_filenames[num], O_RDONLY);
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if (fd == -1)
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{
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printf("read error opening file '%s'\n", _filenames[num]);
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return;
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}
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fstat(fd, &st);
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buf = malloc(st.st_size);
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if (!buf)
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{
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printf("unable to allocate enough memory for reading.\n");
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return;
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}
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res = read(fd, buf, st.st_size);
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if (res == -1)
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{
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printf("unable to read from file '%s'.\n", _filenames[num]);
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return;
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}
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close(fd);
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xid = xmlInitBuffer(buf, st.st_size);
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if (xid)
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{
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void *xrid = xmlMarkId(xid);
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int r = 0;
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walk_the_tree(num, xrid, _root);
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r = xmlErrorGetNo(xrid, 0);
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if (r)
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{
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size_t n = xmlErrorGetLineNo(xrid, 0);
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size_t c = xmlErrorGetColumnNo(xrid, 0);
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const char *s = xmlErrorGetString(xrid, 1); /* clear the error */
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printf("%s: at line %u, column %u: '%s'\n",_filenames[num], n,c, s);
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}
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free(xrid);
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}
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else
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{
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fprintf(stderr, "Error reading file '%s'\n", _filenames[num]);
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}
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xmlClose(xid);
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free(buf);
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}
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int
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main (int argc, char **argv)
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{
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unsigned int u;
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int i;
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if (argc == 1)
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show_help();
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for (i=1; i<argc;)
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{
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int ret = parse_option(argv, i, argc);
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i += ret;
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}
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if (_root == 0) _root = (char *)_static_root;
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if (_element == 0) _element = (char *)_static_element;
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for (u=0; u<_fcount; u++)
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#if USE_BUFFER
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grep_file_buffer(u);
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#else
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grep_file(u);
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#endif
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free_and_exit(0);
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return 0;
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}
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