Club Amiga de Montreal - CAM/CAM_CD_1.iso/files/375.lha/ARPTools_v1.0/src/Head.c

C/C++ Source or Header | 1990-05-02 | 4KB | 212 lines

/*
          Head - Display the first lines of a file.

          Original effort by Fabio Rossetti. Inspired by the head program
          by Gary Brant found on <>< 179.

      (c) 1989 by Fabio Rossetti.

      To compile under Lattice C v5.0x use:

        lc  -O -v -cus head
        blink lib:cres.o head.o to head lib lib:a.lib lib:lc.lib sd nd

*/

#include <exec/types.h>
#include <exec/memory.h>
#include <exec/libraries.h>
#include <libraries/dos.h>
#include <libraries/dosextens.h>
#include <libraries/arpbase.h>
#include <arpfunctions.h>
#include <proto/exec.h>
#include <proto/dos.h>


struct ArpBase *ArpBase=NULL;
struct Process *Pr;
LONG argc;

#define NARGS 4
#define BFSIZE 256
#define FROM    argv[0]
#define TO    argv[1]
#define LIN    argv[2]
#define BAN    argv[3]
STRPTR argv[NARGS];

TEXT *Buf,*OBuf;
TEXT Banner[256];

struct UserAnchor {
    struct    AnchorPath    ua_AP;
    BYTE    moremem[255];    /* extension */
};
struct    UserAnchor *Anchor=NULL;

/* Trick to keep code down to size */
VOID MemCleanup()
{
}

/* shutdown routine */
VOID Cleanup(r1,r2,msg)
LONG r1,r2;
STRPTR msg;
{
    if (msg) Puts(msg);
    if (ArpBase) CloseLibrary((struct Library *)ArpBase);
    Pr->pr_Result2 = r2;
    exit(r1);
}

VOID Head(Inp,Out,lines)
BPTR Inp,Out;
ULONG lines;

{

    REGISTER TEXT c;
    REGISTER ULONG count,l=0,fl=0,i,obp=0;

    /* read until EOF */
    while(count = Read(Inp,Buf,BFSIZE))    {

        /* check break */
        if (SetSignal(0,0) & SIGBREAKF_CTRL_C)
            Cleanup(RETURN_WARN,NULL,"***Break");

        /* scan buffer */
        for(i=0; i < count; i++) {

            c = *(Buf+i);

            *(OBuf + obp++) = c;

            if (obp >= BFSIZE) {
                (VOID)Write(Out,OBuf,obp);
                obp = 0;}

            /* end of line ? */
            if (c == '\n' ) {
                    l++;
                    if (l >= lines) {
                    if (obp) (VOID)Write(Out,OBuf,obp);
                    obp = 0;
                    fl=1;
                    break;
                    }
                }
            }

    if (fl) break;
    }

    if (obp) (VOID)Write(Out,OBuf,obp);
}

VOID _main(Line)
STRPTR Line;
{



    BPTR infh,outfh;
    LONG Lines,Result,i=0;
    char **ArV;
    Pr = (struct Process*)FindTask(NULL);

    if(!(ArpBase = (struct ArpBase*)OpenLibrary(ArpName,ArpVersion)))
            Cleanup(RETURN_FAIL,ERROR_INVALID_RESIDENT_LIBRARY,NULL);

    /* parse command line */
    for (argc=0;argc < NARGS ;++argc)
        argv[argc] = (STRPTR) NULL;

    while(*Line > ' ')
        ++Line;

    if((argc = GADS(++Line,
        strlen(Line),
        "Usage: Head [Files file1 file2 ...] [TO filename] [LIN linenumber] [BAN]",
        argv,
        "Files/...,TO/K,LIN/K,BAN/S" )) < 0)
            Cleanup(RETURN_WARN,NULL,FROM);


        if (!(Buf = ArpAllocMem(BFSIZE,MEMF_CLEAR)) ||
        !(OBuf = ArpAllocMem(BFSIZE,MEMF_CLEAR)))
                Cleanup(RETURN_FAIL,ERROR_NO_FREE_STORE,"Error: no memory");



    if (LIN) {
        Lines = Atol(LIN);
        if((Errno == ERRBADINT) || (Lines <=0))
            Cleanup(RETURN_ERROR,NULL,"Bad args");
        }
    else Lines = 10;

    if(TO) {
            if(!(outfh=ArpOpen(TO,MODE_NEWFILE))) {
                Printf("Can't open %s\n",TO);
                Cleanup(RETURN_ERROR,ERROR_OBJECT_NOT_FOUND,NULL);
                }
            }
    else outfh = Output();


    ArV = (char **)FROM;
    if (ArV[0]) {

    if ( Anchor = (struct UserAnchor *)ArpAlloc( (ULONG)sizeof( *Anchor )) )
    {
        Anchor->ua_AP.ap_Length = 255;    /* Want full path built */

    }
    else
        Cleanup(RETURN_FAIL,ERROR_NO_FREE_STORE,"Error: no memory");

    while (ArV[i] != NULL) {

    Result = FindFirst(ArV[i],(struct AnchorPath*) Anchor);

    while (Result == 0) {

        if (Anchor->ua_AP.ap_Info.fib_DirEntryType < 0) {
            if(!(infh=ArpOpen(Anchor->ua_AP.ap_Buf,MODE_OLDFILE))) {
                Printf("Can't open %s\n",FROM);
                Cleanup(RETURN_ERROR,ERROR_OBJECT_NOT_FOUND,NULL);
                    }
            else {
                if (BAN) {
                    PathName(ArpLock(Anchor->ua_AP.ap_Buf,
                    ACCESS_READ),Banner,255);
                    FPrintf(outfh,"*** File %s ***\n",
                    Banner);
                    }
            Head(infh,outfh,Lines);
            }
            }
        else {
            Printf("%s is a directory !\n",ArV[i]);
            Cleanup(RETURN_ERROR,ERROR_OBJECT_WRONG_TYPE,NULL);
            }
        /*else
            Printf("Can't find %s\n",FROM);
            Cleanup(RETURN_ERROR,ERROR_OBJECT_NOT_FOUND,NULL);
            */

        Result = FindNext((struct AnchorPath*) Anchor );
        }
        i++;
        }
    }

    else Head(Input(),outfh,Lines);

    Cleanup(NULL,NULL,NULL);


}