обнаружен glibc, realloc (): неверный указатель - PullRequest
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обнаружен glibc, realloc (): неверный указатель

4 голосов
/ 15 ноября 2010

Я прошу прощения за длинный код. У меня простой вопрос, но я решил включить свой код, чтобы было ясно, откуда я. Я получаю реаллок коррупцию. Я думаю, что коррупция, потому что я не освобождаю правильно. В действительности я не уверен, что glibc даже говорит или означает. Кто-нибудь может мне это кратко объяснить? Снова извините за длинный код. 

#include "draw2.h"
#include "draw2a.h"
#include "draw2b.h"

const char Exec_c[]  = "java -jar Sketchpad.jar";

void parseFile(FILE * fp, FILE *sketcher){ 
    char line [MAX_WORD] = {"NULL"}; 
    char word [MAX_WORD] = {"NULL"};
    char figureName [MAX_WORD] = {"NULL"};
    struct figure *pointsAndname;                     
    long int countNumberoffigures = 0;
    printOutput();
    long int temp = 10;
    pointsAndname = malloc(temp * sizeof(struct figure));
    assert(pointsAndname != NULL);
    while ( fgets(line, MAX_WORD - 1, fp) != NULL ){
        int nuRead = sscanf(line, "%s", word);
        assert(pointsAndname != NULL);
        if ( nuRead > 0 ){
            if(strncmp(word, "Figure", MAX_WORD)==0){ 
                countNumberoffigures += 1;                      
                if (temp == countNumberoffigures - 1){
                    temp = temp * 2;
                    printf("pointsAndname is %x\n", pointsAndname);
                    pointsAndname = realloc(&pointsAndname, temp * sizeof(struct figure));
                    printf("pointsAndname is %x after realloc\n", pointsAndname);
                }
                assert(pointsAndname != NULL);
                figureFunction(fp,line, word, figureName, countNumberoffigures, pointsAndname + countNumberoffigures);  
            }                                                 
            if(strncmp(word, "printFigure", MAX_WORD)==0){      //4)read the command printFigure, name of the figure
                if (countNumberoffigures == 1){
                    printFigure(fp, line, countNumberoffigures, pointsAndname + countNumberoffigures);
                }else{
                    printFigure(fp, line, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
                }
            }
            if(strncmp(word, "drawFigure", MAX_WORD)==0){       //5)read the command drawFigure and the name of the figure
                if (countNumberoffigures == 1){
                    drawFigure(sketcher, line, countNumberoffigures, pointsAndname + countNumberoffigures);
                }else{
                    drawFigure(sketcher, line, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
                }
            }
            if(strncmp(word, "translate", MAX_WORD)==0){        //6)read the command translate 
                if (countNumberoffigures == 1){
                    translate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures);
                }else{
                    translate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
                }
            }
            if(strncmp(word, "child", MAX_WORD)==0){            //7)reads command child and the name of the figure
                child(line, word, figureName, sketcher);
            }
            if(strncmp(word, "#", MAX_WORD)==0){                //8)reads the whole line until the \n
                printf(line);
                //printf("ani po\n");
            }
            if(strncmp(word, "end", MAX_WORD)==0){
                fprintf (sketcher, "end\n");
                //printf("ani po\n");
            }
            if(strncmp(word, "rotate", MAX_WORD)==0){
                if (countNumberoffigures == 1){
                    rotate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures);
                }else{
                    rotate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
                }
            }
        }
    }
    free(pointsAndname->vertices);
    free(pointsAndname);
}

void processArgument(char argument[]){
    FILE *sketcher;
    FILE *fp;
    fp = fopen (argument, "r");
    sketcher = popen(Exec_c, "w");
    if (fp == NULL){
        printf ("Could not open pipe to %s\n", argument);
        exit (EXIT_FAILURE);
    }
    if (sketcher == NULL){
        printf ("Could not open pipe to %s\n", argument);
        exit (EXIT_FAILURE);
    }else{
        parseFile(fp, sketcher);
        if(fclose(fp)==EOF){
            printf("couldn't close pipe to %s.\n", argument);
            exit(EXIT_FAILURE);
        }
        if (pclose(sketcher) == -1){                                                 //if (pclose(sketcher) == -1){
            fprintf(stderr, "draw_line error: couldn't close pipe to %s.\n", Exec_c);//fprintf(stderr,"",E);
            exit(EXIT_FAILURE);    
        }
    }
}

int main (int argc,  char *argv[]){
    int i;
    if ( argc < 2 ){
        printf ("%s\n", "0 comment(s)");
        exit(EXIT_FAILURE);
    }else{
        for (i = 1; i < argc; i++){
            processArgument(argv[i]);
        }
    }
    return 0;
}

#include "draw2.h"
#include "draw2a.h"

void printOutput(){
    printf("./draw2 started on:");

    fflush(stdout);
    system("date\n");
}
/*send what ever there is after the child to sketchpad(in that specific line)*/
void child (char line[], char word[], char nameFigure[], FILE * sketcher){          
    sscanf(line, "%s%s", word, nameFigure);
    fprintf (sketcher, "%s\n", &line[6]);
} 

/*I construct the struct by reading from the Figure line to the end figure line.*/
void figureFunction (FILE * fp, char line[], char word[], char figureName[], long int countNumberoffigures, struct figure *figureHere){
    double startx, starty;
    long int temp = 10;
    figureHere->vertices = malloc(temp * sizeof(struct pointxy));
    sscanf(line, "%s%s%lf%lf%*s", word, figureHere->figureName, &startx, &starty);
    printf("This is the figureHere->vertices inside the figureFunction: %s\n", figureHere->vertices);
    (*(figureHere->vertices)).x = startx;              
    (*(figureHere->vertices)).y = starty;
    fgets(line, MAX_WORD - 1, fp);                  
    int nuRead = sscanf(line, "%s", word);              
    long int i = 1;                                                     
    while (strncmp(word, "End", MAX_WORD)!=0){ 
        if (strncmp(word, "#", MAX_WORD) == 0){
            printf("%s",line);
        }           
        if (strncmp(word, "draw", MAX_WORD) == 0){
            //printf("lepo ani magia?????\n\n");
            sscanf (line, "%s%lf%lf", word, &startx, &starty);
            //printf("this is my startx and starty: %lf %lf\n\n",startx, starty);
            figureHere->vertices[i].x = figureHere->vertices[i-1].x + startx;
            figureHere->vertices[i].y = figureHere->vertices[i-1].y + starty;
            i += 1;
        }
        fgets(line, MAX_WORD - 1, fp);
        nuRead = sscanf(line, "%s", word);
        if (temp == figureHere->countPoints){
            temp = temp * 2;
            figureHere->vertices = realloc(figureHere->vertices, temp * sizeof(struct pointxy));
        }
    }                                          
    figureHere->countPoints = i;                        
}         

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>

void parseFile(FILE * fp, FILE * sketcher); 
void processArgument(char argument[]);
void printOutput();

#define MAX_WORD 256
#define initial_size 17

extern const char argument[];

/* prototypes for non-c99 library functions */
FILE* popen(const char*, const char*);
int pclose(FILE*);
struct pointxy {
    double x;
    double y;
};

struct figure{
      char figureName[MAX_WORD];
    struct pointxy *vertices;
    long int countPoints;
};

*** glibc detected *** ./draw2: realloc(): invalid pointer: 0xbf9c3a28 ***
======= Backtrace: =========
/lib/libc.so.6(realloc+0x3a8)[0x400cb548]
/lib/libc.so.6(realloc+0x3c)[0x400cb1dc]
./draw2[0x8048ab8]
./draw2[0x8048ec1]
./draw2[0x8048f84]
/lib/libc.so.6(__libc_start_main+0xe0)[0x40072390]
./draw2[0x8048891]
======= Memory map: ========
08048000-0804a000 r-xp 00000000 00:16 160237     /home/dsk07/ugrad/pkardash/c201/assignment2/draw2
0804a000-0804b000 rw-p 00002000 00:16 160237     /home/dsk07/ugrad/pkardash/c201/assignment2/draw2
0804b000-0804c000 rw-p 00000000 00:00 0 
09283000-092a4000 rw-p 00000000 00:00 0          [heap]
40000000-4001c000 r-xp 00000000 08:01 94922      /lib/ld-2.7.so
4001c000-4001d000 r--p 0001b000 08:01 94922      /lib/ld-2.7.so
4001d000-4001e000 rw-p 0001c000 08:01 94922      /lib/ld-2.7.so
4001e000-40022000 rw-p 00000000 00:00 0 
40022000-4002c000 r-xp 00000000 08:07 150880     /usr/lib/libgcc_s.so.1
4002c000-4002d000 rw-p 00009000 08:07 150880     /usr/lib/libgcc_s.so.1
40036000-4005a000 r-xp 00000000 08:01 94889      /lib/libm-2.7.so
4005a000-4005b000 r--p 00023000 08:01 94889      /lib/libm-2.7.so
4005b000-4005c000 rw-p 00024000 08:01 94889      /lib/libm-2.7.so
4005c000-401a1000 r-xp 00000000 08:01 94899      /lib/libc-2.7.so
401a1000-401a2000 ---p 00145000 08:01 94899      /lib/libc-2.7.so
401a2000-401a4000 r--p 00145000 08:01 94899      /lib/libc-2.7.so
401a4000-401a5000 rw-p 00147000 08:01 94899      /lib/libc-2.7.so
401a5000-401a9000 rw-p 00000000 00:00 0 
bf9b0000-bf9c5000 rw-p 00000000 00:00 0          [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0          [vdso]
make: *** [run] Aborted

1 Ответ

16 голосов
/ 15 ноября 2010

glibc сообщает вам, что вы передаете адрес, который не мог быть возвращен из malloc / realloc. Это потому, что вы передаете адрес переменной стека pointsAndName. Вам нужно передать значение, которое вы получили от malloc. Кроме того, всякий раз, когда вы вызываете realloc, вы должны использовать временную переменную. Таким образом, если realloc завершится неудачно, вы все равно освободите исходное значение. 

struct figure *tempPtr = realloc(pointsAndname, temp * sizeof(struct figure));
if(tempPtr == NULL)
{
  // Handle allocation error...
  free(pointsAndname);
}
pointsAndname = tempPtr;
...