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reader.c
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C/C++ Source or Header
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1990-04-19
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121 lines
/*
* Read in makefile
*/
#include <stdio.h>
#include <ctype.h>
#include "h.h"
int lineno;
/*
* Syntax error handler. Print message, with line number, and exits.
*/
void
error(msg, a1, a2, a3)
char *msg;
{
fprintf(stderr, "%s: ", myname);
fprintf(stderr, msg, a1, a2, a3);
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
getline(str, fd)
char *str;
FILE *fd;
{
register char *p;
char *q;
char *point;
int pos = 0;
for (;;) {
point = str + pos;
if (fgets( point, LZ - 1 - pos, fd) == (char *) 0)
return TRUE; /* EOF */
lineno++;
if ((p = index( point, '\n')) == (char *) 0) {
if (feof(fd)) { /* Fake a final newline if missing */
strcat( point, "\n");
p = index( point, '\n');
}
else
error("Line too long");
}
if (p[-1] == '\\') { /* This won't work if there are trailing chars */
p[-1] = '\n';
pos = p - str;
continue;
}
p = str;
while (((q = index(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(ptr)
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);
}