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Annotation of coherent/g/usr/bin/vi/misc.c, revision 1.1

1.1     ! root        1: /* misc.c */
        !             2: 
        !             3: /* Author:
        !             4:  *     Steve Kirkendall
        !             5:  *     14407 SW Teal Blvd. #C
        !             6:  *     Beaverton, OR 97005
        !             7:  *     [email protected]
        !             8:  */
        !             9: 
        !            10: 
        !            11: /* This file contains functions which didn't seem happy anywhere else */
        !            12: 
        !            13: #include "config.h"
        !            14: #include "vi.h"
        !            15: 
        !            16: 
        !            17: /* find a particular line & return a pointer to a copy of its text */
        !            18: char *fetchline(line)
        !            19:        long    line;   /* line number of the line to fetch */
        !            20: {
        !            21:        int             i;
        !            22:        REG char        *scan;  /* used to search for the line in a BLK */
        !            23:        long            l;      /* line number counter */
        !            24:        static BLK      buf;    /* holds ONLY the selected line (as string) */
        !            25:        REG char        *cpy;   /* used while copying the line */
        !            26:        static long     nextline;       /* }  These four variables are used */
        !            27:        static long     chglevel;       /*  } to implement a shortcut when  */
        !            28:        static char     *nextscan;      /*  } consecutive lines are fetched */
        !            29:        static long     nextlnum;       /* }                                */
        !            30: 
        !            31:        /* can we do a shortcut? */
        !            32:        if (changes == chglevel && line == nextline)
        !            33:        {
        !            34:                scan = nextscan;
        !            35:        }
        !            36:        else
        !            37:        {
        !            38:                /* scan lnum[] to determine which block its in */
        !            39:                for (i = 1; line > lnum[i]; i++)
        !            40:                {
        !            41:                }
        !            42:                nextlnum = lnum[i];
        !            43: 
        !            44:                /* fetch text of the block containing that line */
        !            45:                scan = blkget(i)->c;
        !            46: 
        !            47:                /* find the line in the block */
        !            48:                for (l = lnum[i - 1]; ++l < line; )
        !            49:                {
        !            50:                        while (*scan++ != '\n')
        !            51:                        {
        !            52:                        }
        !            53:                }
        !            54:        }
        !            55: 
        !            56:        /* copy it into a block by itself, with no newline */
        !            57:        for (cpy = buf.c; *scan != '\n'; )
        !            58:        {
        !            59:                *cpy++ = *scan++;
        !            60:        }
        !            61:        *cpy = '\0';
        !            62: 
        !            63:        /* maybe speed up the next call to fetchline() ? */
        !            64:        if (line < nextlnum)
        !            65:        {
        !            66:                nextline = line + 1;
        !            67:                chglevel = changes;
        !            68:                nextscan = scan + 1;
        !            69:        }
        !            70:        else
        !            71:        {
        !            72:                nextline = 0;
        !            73:        }
        !            74: 
        !            75:        /* Calls to fetchline() interfere with calls to pfetch().  Make sure
        !            76:         * that pfetch() resets itself on its next invocation.
        !            77:         */
        !            78:        pchgs = 0L;
        !            79: 
        !            80:        /* Return a pointer to the line's text */
        !            81:        return buf.c;
        !            82: }
        !            83: 
        !            84: 
        !            85: /* error message from the regexp code */
        !            86: void regerror(txt)
        !            87: char   *txt;   /* an error message */
        !            88: {
        !            89:        msg("RE error: %s", txt);
        !            90: }
        !            91: 
        !            92: /* This function is equivelent to the pfetch() macro */
        !            93: void   pfetch(l)
        !            94:        long    l;      /* line number of line to fetch */
        !            95: {
        !            96:        if(l != pline || changes != pchgs)
        !            97:        {
        !            98:                pline = (l);
        !            99:                ptext = fetchline(pline);
        !           100:                plen = strlen(ptext);
        !           101:                pchgs = changes;
        !           102:        }
        !           103: }

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