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POC program compile and run on a system and not on another
 

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  1. POC program compile and run on a system and not on another
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    <p>I'm posting here because I couldn't find any help for this on Google.</p> <p>I use Debian squeeze at uni to program some C and can ftp the content to work at home. But, I encountered this problem : a litte program I made compile with no warnings and run flawlessly at uni. But on my PC (GNU/Linux as well), it doesn't at all: Here are the conditions: -using "gcc -g -o -Wextra -ansi prog prog.c" -works at uni, segfault here -valgrind gives me this:</p> <pre><code>==4305== Invalid read of size 1 ==4305== at 0x4EBCD60: __GI___rawmemchr (in /usr/lib/libc-2.18.so) ==4305== by 0x4EA9581: _IO_str_init_static_internal (in /usr/lib/libc-2.18.so) ==4305== by 0x4E99DB6: __isoc99_vsscanf (in /usr/lib/libc-2.18.so) ==4305== by 0x4E99D56: __isoc99_sscanf (in /usr/lib/libc-2.18.so) ==4305== by 0x400B69: main (chomp.c:108) ==4305== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==4305== ==4305== ==4305== Process terminating with default action of signal 11 (SIGSEGV) ==4305== Access not within mapped region at address 0x0 ==4305== at 0x4EBCD60: __GI___rawmemchr (in /usr/lib/libc-2.18.so) ==4305== by 0x4EA9581: _IO_str_init_static_internal (in /usr/lib/libc-2.18.so) ==4305== by 0x4E99DB6: __isoc99_vsscanf (in /usr/lib/libc-2.18.so) ==4305== by 0x4E99D56: __isoc99_sscanf (in /usr/lib/libc-2.18.so) ==4305== by 0x400B69: main (chomp.c:108) ==4305== If you believe this happened as a result of a stack ==4305== overflow in your program's main thread (unlikely but ==4305== possible), you can try to increase the size of the ==4305== main thread stack using the --main-stacksize= flag. ==4305== The main thread stack size used in this run was 8388608. </code></pre> <p>Here's the program:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; typedef struct{ int** tab; int n; int m; }Tablette; typedef enum{J1,J2}Joueur; typedef struct{ Tablette T; Joueur J; }Position; typedef struct{ int x; int y; }Coup; Tablette creer_tablette(int n, int m){ Tablette T; int i,j; T.n=n; T.m=m; T.tab = (int**) malloc(n * sizeof(int*)); if(T.tab==NULL){ printf("Erreur\n"); exit(1); } for(i=0;i&lt;n;i++){ T.tab[i]=(int*)malloc(sizeof(int)*m); } for(i=0;i&lt;n;i++){ if(T.tab[i]==NULL){ printf("Erreur\n"); exit(1); } for(i=0;i&lt;n;i++){ for(j=0;j&lt;m;j++){ T.tab[i][j]=1; } } } return T; } void afficher_tablette(Tablette T){ int i,j; printf(" "); for(j=0;j&lt;T.m;j++) printf("%d ",j+1); printf("\n"); for(i=0;i&lt;T.n;i++){ printf("%d ",i+1); for(j=0;j&lt;T.m;j++){ if(T.tab[i][j]==1) printf("■ "); } printf("\n"); } printf("\n"); } void manger_tablette(Tablette *T, int x, int y){ int i,j; for(i=x;i&lt;T-&gt;n;i++){ for(j=y;j&lt;T-&gt;m;j++){ T-&gt;tab[i][j]=0; } } } int est_legal(Position *pos, Coup *cp){ if((cp-&gt;x)&lt;0 || (cp-&gt;x)&gt;(pos-&gt;T.m) || (cp-&gt;y)&lt;0 || (cp-&gt;y)&gt;(pos-&gt;T.n)) return 0; if(pos-&gt;T.tab[cp-&gt;y][cp-&gt;x]==0) return 0; return 1; } int fin_jeu(Position *pos, Joueur *win){ if(pos-&gt;T.tab[0][0]==0){ *win=pos-&gt;J; return 1; } return 0; } void jouer_coup(Position *pos, Coup *cp){ if(est_legal(pos,cp)==1) manger_tablette(&amp;(pos-&gt;T),(cp-&gt;y-1),(cp-&gt;x-1)); pos-&gt;J=(pos-&gt;J+1)%2; } int main(int argc, char *argv[]){ int n,m; sscanf(argv[2],"%d",&amp;m); sscanf(argv[1],"%d",&amp;n); Tablette T=creer_tablette(n,m); Coup cp; Position pos; Joueur win; pos.T=T; pos.J=J1; while(fin_jeu(&amp;pos,&amp;win)!=1){ afficher_tablette(T); printf("Au tour du Joueur %d\n",pos.J+1); printf("Entrez les coordonnées du carré que vous souhaitez manger\n"); scanf("%d",&amp;(cp.x)); scanf("%d",&amp;(cp.y)); while(est_legal(&amp;pos,&amp;cp)==0){ printf("Coordonnées non valides\n"); scanf("%d",&amp;(cp.x)); scanf("%d",&amp;(cp.y)); } jouer_coup(&amp;pos,&amp;cp); } printf("Le Joueur %d a gagné !\n",pos.J+1); return 0; } </code></pre> <p>Thanks for your attention.</p>
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    1. USJonathan Wood
    1. USuser2887595
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    1. COWhich one is line 108?
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      1. POC program compile and run on a system and not on another
      1. USSJuan76
    2. COYou don't need to cast the return value of `malloc` in a C program.
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      1. POC program compile and run on a system and not on another
      1. USCarl Norum
    3. COSince valgrind is complaining about a read from address 0 in `sscanf()`, it looks like you're probably running the program with too few arguments and you're accessing `argv[1]` and `argv[2]` without checking if they exist (via `argc`).
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      1. POC program compile and run on a system and not on another
      1. USMichael Burr
 

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