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Annotation of coherent/b/lib/libc/gen/malloc/trymallo.c, revision 1.1.1.1

1.1       root        1: /* Test program for malloc errors are
                      2:  * Error 1 area wrong after initialization
                      3:  * Error 2 area wrong after realloc shrink
                      4:  * Error 3 area wrong after realloc expand
                      5:  * First number after error is what byte was expected
                      6:  * Second number is what byte was found
                      7:  * Third number is where
                      8:  * Fourth number is size of area being looked at
                      9:  */
                     10: 
                     11: #define XSIZ 113
                     12: #include <stdio.h>
                     13: 
                     14: extern char *malloc();
                     15: extern char *realloc();
                     16: extern void  free();
                     17: extern unsigned rand();
                     18: 
                     19: static unsigned mct, mfail, rct, rfail, ect, count;
                     20: 
                     21: static struct mloc {
                     22:        char *area;
                     23:        unsigned siz;
                     24: } locs[XSIZ];
                     25: 
                     26: unsigned
                     27: vsiz()
                     28: {
                     29:        unsigned i;
                     30: 
                     31:        i = rand() >> 4;
                     32:        return(i ? i : 10);
                     33: }
                     34:                
                     35: mkval(siz, loc)
                     36: unsigned siz;
                     37: char *loc;
                     38: {
                     39:        char fil=siz;
                     40: 
                     41:        for(;siz>0; siz--)
                     42:                *loc++=fil;
                     43: }
                     44: 
                     45: ckval(point, fill, siz, loc)
                     46: unsigned point, fill, siz;
                     47: char *loc;
                     48: {
                     49:        char fil=fill, chx, *xloc=loc;
                     50:        unsigned  xsiz=siz;
                     51: 
                     52:        for(;siz>0; siz--) {
                     53:                if((chx=*loc++) != fil) {
                     54:                   printf("Error: %d %x %x %d %d\n", 
                     55:                           point, fil, chx, xsiz-siz, xsiz);
                     56:                   ect++;
                     57:                   return(1);
                     58:                }
                     59:        }
                     60:        return(0);
                     61: }
                     62: 
                     63: churn(loc)
                     64: struct mloc *loc;
                     65: {
                     66:        unsigned nsiz;
                     67:        char *savp;
                     68: 
                     69:        if(loc->area == NULL) { /* build an area */
                     70:                mct++;
                     71:                if(NULL != (loc->area=malloc(loc->siz=vsiz())))
                     72:                        mkval(loc->siz, loc->area);
                     73:                else
                     74:                        mfail++;
                     75:                return;
                     76:        }
                     77:        ckval(1, loc->siz, loc->siz, loc->area);
                     78:        if(rand() & (1<<10)) {  /* free or realloc */
                     79:                free(loc->area);
                     80:                loc->area=NULL;
                     81:                count--;        /* frees don't count */
                     82:        } else {
                     83:                rct++;
                     84:                if(NULL != (savp=realloc(loc->area, nsiz=vsiz()))) {
                     85:                        loc->area=savp;
                     86:                        ckval(2+(loc->siz<nsiz), /* 2=contract 3=expand */
                     87:                                 loc->siz,       /* filler byte */
                     88:                                 loc->siz<nsiz ? loc->siz : nsiz, /* size */
                     89:                                 loc->area);     /* area */
                     90:                        mkval(loc->siz=nsiz, loc->area);
                     91:                }
                     92:                else
                     93:                        rfail++;
                     94:        }
                     95: }
                     96: 
                     97: main(argc, argv) int argc; char *argv[];
                     98: {
                     99:        if (argc > 1)
                    100:                srand(atoi(argv[1]));
                    101: 
                    102:        for(count=0; count < XSIZ; count++)
                    103:                locs[count].area = NULL;
                    104: 
                    105:        for(count=0; count<500; count++) {
                    106:                churn(&locs[rand() % XSIZ]);
                    107:                if(!memok())
                    108:                        printf("memok %d\n", count);
                    109:        }
                    110: 
                    111:        printf("%4d mallocs     %4d failed\n", mct, mfail);
                    112:        printf("%4d reallocs    %4d failed\n", rct, rfail);
                    113:        printf("%d errors reported\n", ect);
                    114: }

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