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Annotation of 43BSD/contrib/mkmf/src/iolin.c, revision 1.1

1.1     ! root        1: /* $Header: iolin.c,v 1.1 85/03/14 15:38:25 nicklin Exp $ */
        !             2: 
        !             3: /*
        !             4:  * Author: Peter J. Nicklin
        !             5:  */
        !             6: #include <stdio.h>
        !             7: #include "yesno.h"
        !             8: 
        !             9: char IOBUF[BUFSIZ];                    /* I/O line buffer */
        !            10: short CONTINUE;                                /* does the line continue? */
        !            11: 
        !            12: /*
        !            13:  * getlin() stores a line from input stream in IOBUF. The string is terminated
        !            14:  * by a newline character which is replaced by a null character. getlin()
        !            15:  * returns IOBUF, or null pointer upon end of file.
        !            16:  */
        !            17: char *
        !            18: getlin(stream)
        !            19:        register FILE *stream;          /* input stream */
        !            20: {
        !            21:        register int c;                 /* current character */
        !            22:        register char *iop;             /* IOBUF pointer */
        !            23: 
        !            24:        iop = IOBUF;
        !            25:        while ((c = getc(stream)) != '\n' && c != EOF)
        !            26:                *iop++ = c;
        !            27:        if (c == EOF && iop == IOBUF)
        !            28:                return(NULL);
        !            29:        if (iop != IOBUF && iop[-1] == '\\')
        !            30:                {
        !            31:                iop[-1] = '\0';
        !            32:                CONTINUE = YES;
        !            33:                }
        !            34:        else    {
        !            35:                iop[0] = '\0';
        !            36:                CONTINUE = NO;
        !            37:                }
        !            38:        return(IOBUF);
        !            39: }
        !            40: 
        !            41: 
        !            42: 
        !            43: /*
        !            44:  * purgcontinue() eats up continuation lines from an input stream.
        !            45:  */
        !            46: void
        !            47: purgcontinue(stream)
        !            48:        register FILE *stream;          /* input stream */
        !            49: {
        !            50:        register int c;                 /* current character */
        !            51:        register int lastc;             /* previous character */
        !            52: 
        !            53:        if (CONTINUE == YES)
        !            54:                {
        !            55:                for (;;)
        !            56:                        {
        !            57:                        while ((c = getc(stream)) != '\n' && c != EOF)
        !            58:                                lastc = c;
        !            59:                        if (c == EOF || (c == '\n' && lastc != '\\'))
        !            60:                                break;
        !            61:                        }
        !            62:                CONTINUE = NO;
        !            63:                }
        !            64: }
        !            65: 
        !            66: 
        !            67: 
        !            68: /*
        !            69:  * putlin() writes IOBUF to stream and appends a newline character. If
        !            70:  * IOBUF holds a CONTINUE line, a `\' precedes the newline.
        !            71:  */
        !            72: void
        !            73: putlin(stream)
        !            74:        register FILE *stream;          /* output stream */
        !            75: {
        !            76:        register int c;                 /* current character */
        !            77:        register char *iop;             /* IOBUF pointer */
        !            78: 
        !            79:        iop = IOBUF;
        !            80:        while (c = *iop++)
        !            81:                putc(c, stream);
        !            82:        if (CONTINUE == YES)
        !            83:                putc('\\', stream);
        !            84:        putc('\n', stream);
        !            85: }

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