minix/commands/make/reader.c
2005-04-21 14:53:53 +00:00

134 lines
3 KiB
C
Executable file

/*************************************************************************
*
* m a k e : r e a d e r . c
*
* Read in makefile
*========================================================================
* Edition history
*
* # Date Comments By
* --- -------- ---------------------------------------------------- ---
* 1 ?? ??
* 2 23.08.89 cast to NULL added RAL
* 3 30.08.89 indention changed PSH,RAL
* 4 03.09.89 fixed LZ eliminated RAL
* ------------ Version 2.0 released ------------------------------- RAL
*
*************************************************************************/
#include "h.h"
/*
* Syntax error handler. Print message, with line number, and exits.
*/
void error(msg, a1)
char *msg;
char *a1;
{
fprintf(stderr, "%s: ", myname);
fprintf(stderr, msg, a1);
if (lineno) fprintf(stderr, " in %s near line %d", makefile, lineno);
fputc('\n', stderr);
exit(1);
}
/*
* Read a line into the supplied string. Remove
* comments, ignore blank lines. Deal with quoted (\) #, and
* quoted newlines. If EOF return TRUE.
*
* The comment handling code has been changed to leave comments and
* backslashes alone in shell commands (lines starting with a tab).
* This is not what POSIX wants, but what all makes do. (KJB)
*/
bool getline(strs, fd)
struct str *strs;
FILE *fd;
{
register char *p;
char *q;
int c;
for (;;) {
strs->pos = 0;
for (;;) {
do {
if (strs->pos >= strs->len)
strrealloc(strs);
if ((c = getc(fd)) == EOF)
return TRUE; /* EOF */
(*strs->ptr)[strs->pos++] = c;
} while (c != '\n');
lineno++;
if (strs->pos >= 2 && (*strs->ptr)[strs->pos - 2] == '\\') {
(*strs->ptr)[strs->pos - 2] = '\n';
strs->pos--;
} else {
break;
}
}
if (strs->pos >= strs->len)
strrealloc(strs);
(*strs->ptr)[strs->pos] = '\0';
p = q = *strs->ptr;
while (isspace(*q)) q++;
if (*p != '\t' || *q == '#') {
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 = *strs->ptr;
while (isspace(*p)) /* Checking for blank */
p++;
if (*p != '\0')
return FALSE;
}
}
/*
* 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)
register char **ptr;
{
register char *p;
while (isspace(**ptr)) /* Skip spaces */
(*ptr)++;
if (**ptr == '\0') /* Nothing after spaces */
return ((char *)NULL);
p = *ptr; /* word starts here */
while ((**ptr != '\0') && (!isspace(**ptr)))
(*ptr)++; /* Find end of word */
*(*ptr)++ = '\0'; /* Terminate it */
return(p);
}