15e351555Sbostic /*
233717ddfSbostic * Copyright (c) 1993
333717ddfSbostic * The Regents of the University of California. All rights reserved.
45e351555Sbostic *
55e351555Sbostic * This code is derived from software contributed to Berkeley by
65e351555Sbostic * Christos Zoulas.
75e351555Sbostic *
85e351555Sbostic * %sccs.include.redist.c%
95e351555Sbostic */
105e351555Sbostic
115e351555Sbostic #ifndef lint
12*bbd64002Schristos static char sccsid[] = "@(#)for.c 8.2 (Berkeley) 04/28/95";
135e351555Sbostic #endif /* not lint */
145e351555Sbostic
155e351555Sbostic /*-
165e351555Sbostic * for.c --
175e351555Sbostic * Functions to handle loops in a makefile.
185e351555Sbostic *
195e351555Sbostic * Interface:
205e351555Sbostic * For_Eval Evaluate the loop in the passed line.
215e351555Sbostic * For_Run Run accumulated loop
225e351555Sbostic *
235e351555Sbostic */
245e351555Sbostic
255e351555Sbostic #include <ctype.h>
265e351555Sbostic #include "make.h"
275e351555Sbostic #include "hash.h"
285e351555Sbostic #include "dir.h"
295e351555Sbostic #include "buf.h"
305e351555Sbostic
315e351555Sbostic /*
325e351555Sbostic * For statements are of the form:
335e351555Sbostic *
345e351555Sbostic * .for <variable> in <varlist>
355e351555Sbostic * ...
365e351555Sbostic * .endfor
375e351555Sbostic *
385e351555Sbostic * The trick is to look for the matching end inside for for loop
395e351555Sbostic * To do that, we count the current nesting level of the for loops.
405e351555Sbostic * and the .endfor statements, accumulating all the statements between
415e351555Sbostic * the initial .for loop and the matching .endfor;
425e351555Sbostic * then we evaluate the for loop for each variable in the varlist.
435e351555Sbostic */
445e351555Sbostic
455e351555Sbostic static int forLevel = 0; /* Nesting level */
465e351555Sbostic static char *forVar; /* Iteration variable */
475e351555Sbostic static Buffer forBuf; /* Commands in loop */
485e351555Sbostic static Lst forLst; /* List of items */
495e351555Sbostic
505e351555Sbostic /*
515e351555Sbostic * State of a for loop.
525e351555Sbostic */
53*bbd64002Schristos typedef struct _For {
545e351555Sbostic Buffer buf; /* Unexpanded buffer */
555e351555Sbostic char* var; /* Index name */
565e351555Sbostic Lst lst; /* List of variables */
57*bbd64002Schristos } For;
585e351555Sbostic
59*bbd64002Schristos static int ForExec __P((ClientData, ClientData));
605e351555Sbostic
615e351555Sbostic
625e351555Sbostic
635e351555Sbostic
645e351555Sbostic /*-
655e351555Sbostic *-----------------------------------------------------------------------
665e351555Sbostic * For_Eval --
675e351555Sbostic * Evaluate the for loop in the passed line. The line
685e351555Sbostic * looks like this:
695e351555Sbostic * .for <variable> in <varlist>
705e351555Sbostic *
715e351555Sbostic * Results:
725e351555Sbostic * TRUE: We found a for loop, or we are inside a for loop
735e351555Sbostic * FALSE: We did not find a for loop, or we found the end of the for
745e351555Sbostic * for loop.
755e351555Sbostic *
765e351555Sbostic * Side Effects:
775e351555Sbostic * None.
785e351555Sbostic *
795e351555Sbostic *-----------------------------------------------------------------------
805e351555Sbostic */
815e351555Sbostic int
For_Eval(line)825e351555Sbostic For_Eval (line)
835e351555Sbostic char *line; /* Line to parse */
845e351555Sbostic {
855e351555Sbostic char *ptr = line, *sub, *wrd;
865e351555Sbostic int level; /* Level at which to report errors. */
875e351555Sbostic
885e351555Sbostic level = PARSE_FATAL;
895e351555Sbostic
905e351555Sbostic
915e351555Sbostic if (forLevel == 0) {
925e351555Sbostic Buffer buf;
935e351555Sbostic int varlen;
945e351555Sbostic
95*bbd64002Schristos for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
965e351555Sbostic continue;
975e351555Sbostic /*
985e351555Sbostic * If we are not in a for loop quickly determine if the statement is
995e351555Sbostic * a for.
1005e351555Sbostic */
101*bbd64002Schristos if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
102*bbd64002Schristos !isspace((unsigned char) ptr[3]))
1035e351555Sbostic return FALSE;
1045e351555Sbostic ptr += 3;
1055e351555Sbostic
1065e351555Sbostic /*
1075e351555Sbostic * we found a for loop, and now we are going to parse it.
1085e351555Sbostic */
109*bbd64002Schristos while (*ptr && isspace((unsigned char) *ptr))
1105e351555Sbostic ptr++;
1115e351555Sbostic
1125e351555Sbostic /*
1135e351555Sbostic * Grab the variable
1145e351555Sbostic */
1155e351555Sbostic buf = Buf_Init(0);
116*bbd64002Schristos for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++)
1175e351555Sbostic continue;
1185e351555Sbostic Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd);
1195e351555Sbostic
1205e351555Sbostic forVar = (char *) Buf_GetAll(buf, &varlen);
1215e351555Sbostic if (varlen == 0) {
1225e351555Sbostic Parse_Error (level, "missing variable in for");
1235e351555Sbostic return 0;
1245e351555Sbostic }
1255e351555Sbostic Buf_Destroy(buf, FALSE);
1265e351555Sbostic
127*bbd64002Schristos while (*ptr && isspace((unsigned char) *ptr))
1285e351555Sbostic ptr++;
1295e351555Sbostic
1305e351555Sbostic /*
1315e351555Sbostic * Grab the `in'
1325e351555Sbostic */
133*bbd64002Schristos if (ptr[0] != 'i' || ptr[1] != 'n' ||
134*bbd64002Schristos !isspace((unsigned char) ptr[2])) {
1355e351555Sbostic Parse_Error (level, "missing `in' in for");
1365e351555Sbostic printf("%s\n", ptr);
1375e351555Sbostic return 0;
1385e351555Sbostic }
1395e351555Sbostic ptr += 3;
1405e351555Sbostic
141*bbd64002Schristos while (*ptr && isspace((unsigned char) *ptr))
1425e351555Sbostic ptr++;
1435e351555Sbostic
1445e351555Sbostic /*
1455e351555Sbostic * Make a list with the remaining words
1465e351555Sbostic */
1475e351555Sbostic forLst = Lst_Init(FALSE);
1485e351555Sbostic buf = Buf_Init(0);
1495e351555Sbostic sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
1505e351555Sbostic
1515e351555Sbostic #define ADDWORD() \
1525e351555Sbostic Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \
1535e351555Sbostic Buf_AddByte(buf, (Byte) '\0'), \
1545e351555Sbostic Lst_AtEnd(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \
1555e351555Sbostic Buf_Destroy(buf, FALSE)
1565e351555Sbostic
157*bbd64002Schristos for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
1585e351555Sbostic continue;
1595e351555Sbostic
1605e351555Sbostic for (wrd = ptr; *ptr; ptr++)
161*bbd64002Schristos if (isspace((unsigned char) *ptr)) {
1625e351555Sbostic ADDWORD();
1635e351555Sbostic buf = Buf_Init(0);
164*bbd64002Schristos while (*ptr && isspace((unsigned char) *ptr))
1655e351555Sbostic ptr++;
1665e351555Sbostic wrd = ptr--;
1675e351555Sbostic }
1685e351555Sbostic if (DEBUG(FOR))
1695e351555Sbostic (void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub);
1705e351555Sbostic if (ptr - wrd > 0)
1715e351555Sbostic ADDWORD();
1725e351555Sbostic else
1735e351555Sbostic Buf_Destroy(buf, TRUE);
1745e351555Sbostic free((Address) sub);
1755e351555Sbostic
1765e351555Sbostic forBuf = Buf_Init(0);
1775e351555Sbostic forLevel++;
1785e351555Sbostic return 1;
1795e351555Sbostic }
1805e351555Sbostic else if (*ptr == '.') {
1815e351555Sbostic
182*bbd64002Schristos for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
1835e351555Sbostic continue;
1845e351555Sbostic
185*bbd64002Schristos if (strncmp(ptr, "endfor", 6) == 0 &&
186*bbd64002Schristos (isspace((unsigned char) ptr[6]) || !ptr[6])) {
1875e351555Sbostic if (DEBUG(FOR))
1885e351555Sbostic (void) fprintf(stderr, "For: end for %d\n", forLevel);
1895e351555Sbostic if (--forLevel < 0) {
1905e351555Sbostic Parse_Error (level, "for-less endfor");
1915e351555Sbostic return 0;
1925e351555Sbostic }
1935e351555Sbostic }
194*bbd64002Schristos else if (strncmp(ptr, "for", 3) == 0 &&
195*bbd64002Schristos isspace((unsigned char) ptr[3])) {
1965e351555Sbostic forLevel++;
1975e351555Sbostic if (DEBUG(FOR))
1985e351555Sbostic (void) fprintf(stderr, "For: new loop %d\n", forLevel);
1995e351555Sbostic }
2005e351555Sbostic }
2015e351555Sbostic
2025e351555Sbostic if (forLevel != 0) {
2035e351555Sbostic Buf_AddBytes(forBuf, strlen(line), (Byte *) line);
2045e351555Sbostic Buf_AddByte(forBuf, (Byte) '\n');
2055e351555Sbostic return 1;
2065e351555Sbostic }
2075e351555Sbostic else {
2085e351555Sbostic return 0;
2095e351555Sbostic }
2105e351555Sbostic }
2115e351555Sbostic
2125e351555Sbostic /*-
2135e351555Sbostic *-----------------------------------------------------------------------
2145e351555Sbostic * ForExec --
2155e351555Sbostic * Expand the for loop for this index and push it in the Makefile
2165e351555Sbostic *
2175e351555Sbostic * Results:
2185e351555Sbostic * None.
2195e351555Sbostic *
2205e351555Sbostic * Side Effects:
2215e351555Sbostic * None.
2225e351555Sbostic *
2235e351555Sbostic *-----------------------------------------------------------------------
2245e351555Sbostic */
2255e351555Sbostic static int
ForExec(namep,argp)226*bbd64002Schristos ForExec(namep, argp)
227*bbd64002Schristos ClientData namep;
228*bbd64002Schristos ClientData argp;
2295e351555Sbostic {
230*bbd64002Schristos char *name = (char *) namep;
231*bbd64002Schristos For *arg = (For *) argp;
2325e351555Sbostic int len;
2335e351555Sbostic Var_Set(arg->var, name, VAR_GLOBAL);
2345e351555Sbostic if (DEBUG(FOR))
2355e351555Sbostic (void) fprintf(stderr, "--- %s = %s\n", arg->var, name);
2365e351555Sbostic Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len),
2375e351555Sbostic VAR_GLOBAL, FALSE));
2385e351555Sbostic Var_Delete(arg->var, VAR_GLOBAL);
2395e351555Sbostic
2405e351555Sbostic return 0;
2415e351555Sbostic }
2425e351555Sbostic
2435e351555Sbostic
2445e351555Sbostic /*-
2455e351555Sbostic *-----------------------------------------------------------------------
2465e351555Sbostic * For_Run --
2475e351555Sbostic * Run the for loop, immitating the actions of an include file
2485e351555Sbostic *
2495e351555Sbostic * Results:
2505e351555Sbostic * None.
2515e351555Sbostic *
2525e351555Sbostic * Side Effects:
2535e351555Sbostic * None.
2545e351555Sbostic *
2555e351555Sbostic *-----------------------------------------------------------------------
2565e351555Sbostic */
2575e351555Sbostic void
For_Run()2585e351555Sbostic For_Run()
2595e351555Sbostic {
260*bbd64002Schristos For arg;
2615e351555Sbostic
2625e351555Sbostic if (forVar == NULL || forBuf == NULL || forLst == NULL)
2635e351555Sbostic return;
2645e351555Sbostic arg.var = forVar;
2655e351555Sbostic arg.buf = forBuf;
2665e351555Sbostic arg.lst = forLst;
2675e351555Sbostic forVar = NULL;
2685e351555Sbostic forBuf = NULL;
2695e351555Sbostic forLst = NULL;
2705e351555Sbostic
2715e351555Sbostic Lst_ForEach(arg.lst, ForExec, (ClientData) &arg);
2725e351555Sbostic
2735e351555Sbostic free((Address)arg.var);
274*bbd64002Schristos Lst_Destroy(arg.lst, (void (*) __P((ClientData))) free);
2755e351555Sbostic Buf_Destroy(arg.buf, TRUE);
2765e351555Sbostic }
277