ini.cpp

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00001 /* $Id: ini.cpp 15085 2009-01-14 20:23:45Z peter1138 $ */
00002 
00005 #include "stdafx.h"
00006 #include "core/alloc_func.hpp"
00007 #include "core/math_func.hpp"
00008 #include "debug.h"
00009 #include "ini_type.h"
00010 #include "string_func.h"
00011 #include "fileio_func.h"
00012 
00013 IniItem::IniItem(IniGroup *parent, const char *name, size_t len) : next(NULL), value(NULL), comment(NULL)
00014 {
00015   if (len == 0) len = strlen(name);
00016 
00017   this->name = strndup(name, len);
00018   *parent->last_item = this;
00019   parent->last_item = &this->next;
00020 }
00021 
00022 IniItem::~IniItem()
00023 {
00024   free(this->name);
00025   free(this->value);
00026   free(this->comment);
00027 
00028   delete this->next;
00029 }
00030 
00031 void IniItem::SetValue(const char *value)
00032 {
00033   free(this->value);
00034   this->value = strdup(value);
00035 }
00036 
00037 IniGroup::IniGroup(IniFile *parent, const char *name, size_t len) : next(NULL), type(IGT_VARIABLES), item(NULL), comment(NULL)
00038 {
00039   if (len == 0) len = strlen(name);
00040 
00041   this->name = strndup(name, len);
00042   this->last_item = &this->item;
00043   *parent->last_group = this;
00044   parent->last_group = &this->next;
00045 
00046   if (parent->list_group_names == NULL) return;
00047 
00048   for (uint i = 0; parent->list_group_names[i] != NULL; i++) {
00049     if (strcmp(this->name, parent->list_group_names[i]) == 0) {
00050       this->type = IGT_LIST;
00051       return;
00052     }
00053   }
00054 }
00055 
00056 IniGroup::~IniGroup()
00057 {
00058   free(this->name);
00059   free(this->comment);
00060 
00061   delete this->item;
00062   delete this->next;
00063 }
00064 
00065 IniItem *IniGroup::GetItem(const char *name, bool create)
00066 {
00067   IniItem *item;
00068   size_t len = strlen(name);
00069 
00070   for (item = this->item; item != NULL; item = item->next) {
00071     if (strcmp(item->name, name) == 0) return item;
00072   }
00073 
00074   if (!create) return NULL;
00075 
00076   /* otherwise make a new one */
00077   return new IniItem(this, name, len);
00078 }
00079 
00080 void IniGroup::Clear()
00081 {
00082   delete this->item;
00083   this->item = NULL;
00084   this->last_item = &this->item;
00085 }
00086 
00087 IniFile::IniFile(const char **list_group_names) : group(NULL), comment(NULL), list_group_names(list_group_names)
00088 {
00089   this->last_group = &this->group;
00090 }
00091 
00092 IniFile::~IniFile()
00093 {
00094   free(this->comment);
00095   delete this->group;
00096 }
00097 
00098 IniGroup *IniFile::GetGroup(const char *name, size_t len)
00099 {
00100   IniGroup *group;
00101 
00102   if (len == 0) len = strlen(name);
00103 
00104   /* does it exist already? */
00105   for (group = this->group; group != NULL; group = group->next) {
00106     if (!memcmp(group->name, name, len) && group->name[len] == 0) {
00107       return group;
00108     }
00109   }
00110 
00111   /* otherwise make a new one */
00112   group = new IniGroup(this, name, len);
00113   group->comment = strdup("\n");
00114   return group;
00115 }
00116 
00117 void IniFile::RemoveGroup(const char *name)
00118 {
00119   size_t len = strlen(name);
00120   IniGroup *prev = NULL;
00121   IniGroup *group;
00122 
00123   /* does it exist already? */
00124   for (group = this->group; group != NULL; prev = group, group = group->next) {
00125     if (memcmp(group->name, name, len) == 0) {
00126       break;
00127     }
00128   }
00129 
00130   if (group == NULL) return;
00131 
00132   if (prev != NULL) {
00133     prev->next = prev->next->next;
00134     if (this->last_group == &group->next) this->last_group = &prev->next;
00135   } else {
00136     this->group = this->group->next;
00137     if (this->last_group == &group->next) this->last_group = &this->group;
00138   }
00139 
00140   group->next = NULL;
00141   delete group;
00142 }
00143 
00144 void IniFile::LoadFromDisk(const char *filename)
00145 {
00146   assert(this->last_group == &this->group);
00147 
00148   char buffer[1024], c, *s, *t, *e;
00149   IniGroup *group = NULL;
00150   IniItem *item = NULL;
00151 
00152   char *comment = NULL;
00153   uint comment_size = 0;
00154   uint comment_alloc = 0;
00155 
00156   size_t end;
00157   /*
00158    * Now we are going to open a file that contains no more than simple
00159    * plain text. That would raise the question: "why open the file as
00160    * if it is a binary file?". That's simple... Microsoft, in all
00161    * their greatness and wisdom decided it would be useful if ftell
00162    * is aware of '\r\n' and "sees" that as a single character. The
00163    * easiest way to test for that situation is by searching for '\n'
00164    * and decrease the value every time you encounter a '\n'. This will
00165    * thus also make ftell "see" the '\r' when it is not there, so the
00166    * result of ftell will be highly unreliable. So to work around this
00167    * marvel of wisdom we have to open in as a binary file.
00168    */
00169   FILE *in = FioFOpenFile(filename, "rb", DATA_DIR, &end);
00170   if (in == NULL) return;
00171 
00172   end += ftell(in);
00173 
00174   /* for each line in the file */
00175   while ((size_t)ftell(in) < end && fgets(buffer, sizeof(buffer), in)) {
00176     /* trim whitespace from the left side */
00177     for (s = buffer; *s == ' ' || *s == '\t'; s++) {}
00178 
00179     /* trim whitespace from right side. */
00180     e = s + strlen(s);
00181     while (e > s && ((c = e[-1]) == '\n' || c == '\r' || c == ' ' || c == '\t')) e--;
00182     *e = '\0';
00183 
00184     /* skip comments and empty lines */
00185     if (*s == '#' || *s == ';' || *s == '\0') {
00186       uint ns = comment_size + (e - s + 1);
00187       uint a = comment_alloc;
00188       uint pos;
00189       /* add to comment */
00190       if (ns > a) {
00191         a = max(a, 128U);
00192         do a *= 2; while (a < ns);
00193         comment = ReallocT(comment, comment_alloc = a);
00194       }
00195       pos = comment_size;
00196       comment_size += (e - s + 1);
00197       comment[pos + e - s] = '\n'; // comment newline
00198       memcpy(comment + pos, s, e - s); // copy comment contents
00199       continue;
00200     }
00201 
00202     /* it's a group? */
00203     if (s[0] == '[') {
00204       if (e[-1] != ']') {
00205         ShowInfoF("ini: invalid group name '%s'", buffer);
00206       } else {
00207         e--;
00208       }
00209       s++; // skip [
00210       group = new IniGroup(this, s, e - s);
00211       if (comment_size) {
00212         group->comment = strndup(comment, comment_size);
00213         comment_size = 0;
00214       }
00215     } else if (group) {
00216       /* find end of keyname */
00217       if (*s == '\"') {
00218         s++;
00219         for (t = s; *t != '\0' && *t != '\"'; t++) {}
00220         if (*t == '\"') *t = ' ';
00221       } else {
00222         for (t = s; *t != '\0' && *t != '=' && *t != '\t' && *t != ' '; t++) {}
00223       }
00224 
00225       /* it's an item in an existing group */
00226       item = new IniItem(group, s, t-s);
00227       if (comment_size) {
00228         item->comment = strndup(comment, comment_size);
00229         comment_size = 0;
00230       }
00231 
00232       /* find start of parameter */
00233       while (*t == '=' || *t == ' ' || *t == '\t') t++;
00234 
00235 
00236       /* remove starting quotation marks */
00237       if (*t == '\"') t++;
00238       /* remove ending quotation marks */
00239       e = t + strlen(t);
00240       if (e > t && e[-1] == '\"') e--;
00241       *e = '\0';
00242 
00243       item->value = strndup(t, e - t);
00244     } else {
00245       /* it's an orphan item */
00246       ShowInfoF("ini: '%s' outside of group", buffer);
00247     }
00248   }
00249 
00250   if (comment_size > 0) {
00251     this->comment = strndup(comment, comment_size);
00252     comment_size = 0;
00253   }
00254 
00255   free(comment);
00256   fclose(in);
00257 }
00258 
00259 bool IniFile::SaveToDisk(const char *filename)
00260 {
00261   FILE *f;
00262   IniGroup *group;
00263   IniItem *item;
00264 
00265   f = fopen(filename, "w");
00266   if (f == NULL) return false;
00267 
00268   for (group = this->group; group != NULL; group = group->next) {
00269     if (group->comment) fputs(group->comment, f);
00270     fprintf(f, "[%s]\n", group->name);
00271     for (item = group->item; item != NULL; item = item->next) {
00272       assert(item->value != NULL);
00273       if (item->comment != NULL) fputs(item->comment, f);
00274 
00275       /* protect item->name with quotes if needed */
00276       if (strchr(item->name, ' ') != NULL) {
00277         fprintf(f, "\"%s\"", item->name);
00278       } else {
00279         fprintf(f, "%s", item->name);
00280       }
00281 
00282       fprintf(f, " = %s\n", item->value);
00283     }
00284   }
00285   if (this->comment) fputs(this->comment, f);
00286 
00287   fclose(f);
00288   return true;
00289 }

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