ack/util/make/reader.c

/*
 *  Read in makefile
 *
 *  $Header$
 */


#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "h.h"


int lineno;


/*
 *  Syntax error handler.  Print message, with line number, and exits.
 */
/*VARARGS1*/
void error(char *msg, char* a1)
{
    fprintf(stderr, "%s: ", myname);
    if (a1 != NULL)
    {
    	fprintf(stderr, msg, a1);
    } else
    {
    	fprintf(stderr, "%s",msg);
    }

    if (lineno)
        fprintf(stderr, " near line %d", lineno);
    fputc('\n', stderr);
    exit(1);
}


/*
 *  Read a line into the supplied string of length LZ.  Remove
 *  comments, ignore blank lines. Deal with quoted (\) #, and
 *  quoted newlines.  If EOF return TRUE.
 */
bool mgetline(char* str, FILE* fd)
{
    register char *     p;
    char *          q;
    int         pos = 0;


    for (;;)
    {
        if (fgets(str+pos, LZ-pos, fd) == (char *)0)
            return TRUE;        /*  EOF  */

        lineno++;

        if ((p = strchr(str+pos, '\n')) == (char *)0)
            error("Line too long", NULL);

        if (p[-1] == '\\')
        {
            p[-1] = '\n';
            pos = p - str;
            continue;
        }

        p = str;
        while (((q = strchr(p, '#')) != (char *)0) &&
            (p != q) && (q[-1] == '\\'))
        {
            char    *a;

            a = q - 1;  /*  Del \ chr; move rest back  */
            p = q;
            while ((*a++ = *q++))
                ;
        }
        if (q != (char *)0)
        {
            q[0] = '\n';
            q[1] = '\0';
        }

        p = str;
        while (isspace(*p)) /*  Checking for blank  */
            p++;

        if (*p != '\0')
            return FALSE;
        pos = 0;
    }
}


/*
 *  Get a word from the current line, surounded by white space.
 *  return a pointer to it. String returned has no white spaces
 *  in it.
 */
char *gettok(char **ptr)
{
    register char *     p;


    while (isspace(**ptr))  /*  Skip spaces  */
        (*ptr)++;

    if (**ptr == '\0')  /*  Nothing after spaces  */
        return NULL;

    p = *ptr;       /*  word starts here  */

    while ((**ptr != '\0') && (!isspace(**ptr)))
        (*ptr)++;   /*  Find end of word  */

    *(*ptr)++ = '\0';   /*  Terminate it  */

    return(p);
}