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Annotation of 43BSD/contrib/icon/functions/read.c, revision 1.1.1.1

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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