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Annotation of 43BSD/contrib/icon/functions/read.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * read(f) - read line on file f.
        !             5:  */
        !             6: Xread(nargs, arg1, arg0)
        !             7: int nargs;
        !             8: struct descrip arg1, arg0;
        !             9:    {
        !            10:    register int slen;
        !            11:    int status;
        !            12:    char sbuf[MAXREADSTRING];
        !            13:    FILE *f;
        !            14:    extern char *alcstr();
        !            15: 
        !            16:    /*
        !            17:     * Default f to &input.
        !            18:     */
        !            19:    deffile(&arg1, &input);
        !            20:    /*
        !            21:     * Get a pointer to the file and be sure that it's open for reading.
        !            22:     */
        !            23:    f = BLKLOC(arg1)->file.fd;
        !            24:    status = BLKLOC(arg1)->file.status;
        !            25:    if ((status & FS_READ) == 0)
        !            26:       runerr(212, &arg1);
        !            27: 
        !            28:    /*
        !            29:     * Use getstr to read a line from the file, failing if getstr
        !            30:     *  encounters end of file.
        !            31:     */
        !            32:    if ((slen = getstr(sbuf,MAXREADSTRING,f)) < 0)
        !            33:       fail();
        !            34:    /*
        !            35:     * Allocate the string read and make arg0 a descriptor for it.
        !            36:     */
        !            37:    sneed(slen);
        !            38:    STRLEN(arg0) = slen;
        !            39:    STRLOC(arg0) = alcstr(sbuf,slen);
        !            40:    }
        !            41: 
        !            42: Procblock(read,1)

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