2

du5/a_station.c

@@ -3,87 +3,91 @@
 #include <string.h>
 #include "a_station.h"
 
-static unsigned long hash_string(const char* t){
-    unsigned long h=0;int c;
-    while((c=*t++)){h=h*31+c;}
+static unsigned long vytvor_hash(const char* nazov){
+    unsigned long h=0;int z;
+    while((z=*nazov++))h=h*31+z;
     return h;
 }
 
 struct station* create_station(){
-    struct station* s=malloc(sizeof(struct station));
-    if(s==NULL)return NULL;
-    s->tracks=calloc(STATION_SIZE,sizeof(struct car*));
-    if(s->tracks==NULL){free(s);return NULL;}
-    s->track_count=STATION_SIZE;
-    return s;
+    struct station* stanica=malloc(sizeof(struct station));
+    if(!stanica)return NULL;
+    stanica->tracks=calloc(STATION_SIZE,sizeof(struct car*));
+    if(!stanica->tracks){free(stanica);return NULL;}
+    stanica->track_count=STATION_SIZE;
+    return stanica;
 }
 
-void destroy_station(struct station* s){
-    if(s==NULL)return;
-    for(int i=0;i<s->track_count;i++){
-        struct car* c=s->tracks[i];
-        while(c!=NULL){
-            struct car* n=c->next;
-            free(c);
-            c=n;
+void destroy_station(struct station* stanica){
+    if(!stanica)return;
+    for(int i=0;i<stanica->track_count;i++){
+        struct car* a=stanica->tracks[i];
+        while(a){
+            struct car* d=a->next;
+            free(a);
+            a=d;
         }
     }
-    free(s->tracks);
-    free(s);
+    free(stanica->tracks);
+    free(stanica);
 }
 
-int select_track(struct station* s,const char* t){
-    if(s==NULL||t==NULL)return 0;
-    unsigned long h=hash_string(t);
-    return (int)(h%s->track_count);
+int select_track(struct station* stanica,const char* nazov){
+    if(!stanica||!nazov)return 0;
+    unsigned long h=vytvor_hash(nazov);
+    return (int)(h%stanica->track_count);
 }
 
-void add_target_capacity(struct station* s,const char* t,int cap){
-    if(s==NULL||t==NULL)return;
-    int tr=select_track(s,t);
-    struct car* c=s->tracks[tr];
+void add_target_capacity(struct station* stanica,const char* nazov,int pocet){
+    if(!stanica||!nazov)return;
+    int cislo=select_track(stanica,nazov);
+    struct car* a=stanica->tracks[cislo];
     struct car* p=NULL;
-    while(c!=NULL){
-        if(strcmp(c->value,t)==0){c->capacity+=cap;return;}
-        p=c;c=c->next;
+    while(a){
+        if(strcmp(a->value,nazov)==0){
+            a->capacity+=pocet;
+            return;
         }
-    struct car* n=malloc(sizeof(struct car));
-    if(n==NULL)return;
-    strncpy(n->value,t,TARGET_SIZE-1);
-    n->value[TARGET_SIZE-1]='\0';
-    n->capacity=cap;
-    n->next=NULL;
-    if(p==NULL)s->tracks[tr]=n;else p->next=n;
+        p=a;a=a->next;
+    }
+    struct car* novy=malloc(sizeof(struct car));
+    if(!novy)return;
+    strncpy(novy->value,nazov,TARGET_SIZE-1);
+    novy->value[TARGET_SIZE-1]='\0';
+    novy->capacity=pocet;
+    novy->next=NULL;
+    if(p==NULL)stanica->tracks[cislo]=novy;
+    else p->next=novy;
 }
 
-int get_target_capacity(struct station* s,const char* t){
-    if(s==NULL||t==NULL)return 0;
-    int tr=select_track(s,t);
-    struct car* c=s->tracks[tr];
-    while(c!=NULL){
-        if(strcmp(c->value,t)==0)return c->capacity;
-        c=c->next;
+int get_target_capacity(struct station* stanica,const char* nazov){
+    if(!stanica||!nazov)return 0;
+    int cislo=select_track(stanica,nazov);
+    struct car* a=stanica->tracks[cislo];
+    while(a){
+        if(strcmp(a->value,nazov)==0)return a->capacity;
+        a=a->next;
     }
     return 0;
 }
 
-int count_targets(struct station* s){
-    if(s==NULL)return 0;
-    int cnt=0;
-    for(int i=0;i<s->track_count;i++){
-        struct car* c=s->tracks[i];
-        while(c!=NULL){cnt++;c=c->next;}
+int count_targets(struct station* stanica){
+    if(!stanica)return 0;
+    int pocet=0;
+    for(int i=0;i<stanica->track_count;i++){
+        struct car* a=stanica->tracks[i];
+        while(a){pocet++;a=a->next;}
     }
-    return cnt;
+    return pocet;
 }
 
-int count_capacity(struct station* s){
-    if(s==NULL)return 0;
-    int sum=0;
-    for(int i=0;i<s->track_count;i++){
-        struct car* c=s->tracks[i];
-        while(c!=NULL){sum+=c->capacity;c=c->next;}
+int count_capacity(struct station* stanica){
+    if(!stanica)return 0;
+    int suma=0;
+    for(int i=0;i<stanica->track_count;i++){
+        struct car* a=stanica->tracks[i];
+        while(a){suma+=a->capacity;a=a->next;}
     }
-    return sum;
+    return suma;
 }