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-rw-r--r--build.c87
1 files changed, 64 insertions, 23 deletions
diff --git a/build.c b/build.c
index e69164c..230dea9 100644
--- a/build.c
+++ b/build.c
@@ -4,21 +4,37 @@
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
+#include <unistd.h>
#define USAGE "usage: %s file [...]\n", argv[0]
+extern char *optarg;
+extern int optind;
+
int
main(int argc, char *argv[])
{
char *b, *bb, *bbb, buf[1024], *cmd[32], dep[1024], *t, *tt, tgt[64];
FILE *fp;
- int i, icmd, j, max;
+ int c, dflag, i, icmd, j, max;
struct stat sb, ssb;
tgt[0] = dep[0] = 0;
/* process arguments */
- if (argc-1 == 0) {
+ dflag = 0;
+ while ((c = getopt(argc, argv, "d")) != -1)
+ switch (c) {
+ case 'd':
+ dflag++;
+ break;
+ default:
+ fprintf(stderr, USAGE);
+ return 1;
+ }
+ argc -= optind;
+ argv += optind;
+ if (argc == 0) {
fprintf(stderr, USAGE);
return 1;
}
@@ -30,7 +46,7 @@ main(int argc, char *argv[])
}
/* process each file */
- for (i = 1, icmd = 0; i < argc; i++, icmd = 0) {
+ for (i = icmd = 0; i < argc; i++, icmd = 0) {
fp = fopen(argv[i], "r");
if (!fp) err(1, "fopen");
@@ -55,12 +71,21 @@ main(int argc, char *argv[])
strncpy(tgt,b+1,sizeof(tgt)-1);
}
+
+ if (dflag < 3) continue;
+ fprintf(stderr,
+ "%s: command line '%s'\n",
+ argv[i], buf);
continue;
}
- /* depend line */
+ /* depends line */
if (*(b+1) == '%' && *(b+2) == ' ') {
strncpy(dep, b+3, sizeof(dep)-1);
+ if (dflag < 3) continue;
+ fprintf(stderr,
+ "%s: depends line '%s'\n",
+ argv[i], buf);
continue;
}
}
@@ -83,32 +108,48 @@ main(int argc, char *argv[])
err(1, t);
if (stat(argv[i], &sb))
err(1, argv[i]);
- if (sb.st_mtime > ssb.st_mtime)
+ if (sb.st_mtime > ssb.st_mtime) {
+ if (dflag)
+ fprintf(stderr, "%s: building because "
+ "%s is modified\n", argv[i], argv[i]);
goto build;
+ }
+
+ if (!*dep)
+ goto uptodate;
/* compare dependencies > target */
- if (*dep) {
- for (t = dep; *t; t++)
- if (!isspace(*t)) break;
- for (j = 0; t[j]; j++) {
- if (isspace(t[j]) || t[j+1] == 0) {
- tt = strdup(t);
- tt[j+(t[j+1]==0)] = 0;
-
- if (stat(tt, &sb))
- err(1, tt);
- free(tt);
- if (sb.st_mtime > ssb.st_mtime)
- goto build;
-
- for (; t[j]; j++)
- if (!isspace(t[j])) break;
- t += j;
- j = 0;
+ for (t = dep; *t; t++)
+ if (!isspace(*t)) break;
+ for (j = 0; t[j]; j++) {
+ if (isspace(t[j]) || t[j+1] == 0) {
+ tt = strdup(t);
+ tt[j+(t[j+1]==0)] = 0;
+
+ if (dflag > 1)
+ fprintf(stderr, "%s: depend '%s'\n",
+ argv[i], tt);
+
+ if (stat(tt, &sb))
+ err(1, tt);
+ free(tt);
+ if (sb.st_mtime > ssb.st_mtime) {
+ if (dflag)
+ fprintf(stderr,
+ "%s: building because "
+ "%s is modified\n",
+ argv[i], tt);
+ goto build;
}
+
+ for (; t[j]; j++)
+ if (!isspace(t[j])) break;
+ t += j;
+ j = 0;
}
}
+uptodate:
fprintf(stderr, "%s: already up-to-date\n", argv[i]);
goto done;