nkiss

commit d737825b1eb7fb43734f64ddaf067e0a3ef12d9c
parent 15c6d0445e25e7d0ceb25b798ae7989fb2b1c03d
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Sun, 21 Feb 2021 16:00:52 -0600

add alt.*

Diffstat:
A
alt.c
 | 
146
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
alt.h
 | 
10
++++++++++

2 files changed, 156 insertions(+), 0 deletions(-)
diff --git a/alt.c b/alt.c
@@ -0,0 +1,146 @@
+#define _BSD_SOURCE
+
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "pkg.h"
+#include "alt.h"
+#include "util.h"
+
+void
+alt_from_choice(struct alt_t *alt, char *fname)
+{
+    char *term;
+
+    if (strlen(fname) >= PATH_LEN)
+        die("choice %s too long", fname);
+    
+    /* choice must contain '>' */
+    if ((term = memccpy(alt->name, fname, '>', strlen(fname))))
+        *(term-1) = '\0';
+    else
+        die("malformatted fname %s", fname);
+
+    strcpy(alt->path, strchr(fname, '>'));
+    strrepl(alt->path, '>', '/');
+}
+
+/* dest *must* be at least PKG_NAME_SIZE + ALT_PATH_SIZE */
+static void
+to_choice(struct alt_t *alt, char *dest)
+{
+    char *end;
+    /* choice system uses '>' to represent slashes, so if the path already
+     * contains a '>', it cannot be used as an alternative */
+    if (strchr(alt->path, '>'))
+        die("Path '%s' in package '%s' contains '>'", alt->path, alt->name);
+
+    end = stpcpy(dest, alt->name);
+    strcpy(end, alt->path);
+
+    strrepl(dest, '/', '>');
+}
+
+static int
+alt_sort(const void *a, const void *b)
+{
+    struct alt_t *alta = (struct alt_t *)a;
+    struct alt_t *altb = (struct alt_t *)b;
+    int first;
+
+    if ((first = strcmp(alta->name, altb->name)) != 0)
+        return first;
+
+    return strcmp(alta->path, altb->path);
+}
+
+void
+alt_load(struct alt_t *alts)
+{
+    DIR *choices;
+    struct dirent *choice;
+    int count = 0;
+
+    if ((choices = opendir(KISS_CHOICES)) == NULL)
+        die("couldn't open choices database:");
+
+    choice = readdir(choices);
+    for (; choice != NULL; choice = readdir(choices)) {
+        if (choice->d_name[0] == '.')
+            continue;
+
+        alt_from_choice(&alts[count], choice->d_name);
+        count++;
+    }
+    closedir(choices);
+
+    qsort(alts, count, sizeof(struct alt_t), &alt_sort);
+
+    for (int i = 0; i < count; i++)
+        printf("%s %s\n", alts[i].name, alts[i].path);
+}
+
+void
+alt_owner(char owner[PKG_NAME_MAX], char *path)
+{
+    char mpath[PATH_LEN], line[PATH_LEN], *p;
+    FILE *mfile;
+    DIR *installed;
+    struct dirent *pkg;
+    int c;
+
+    if ((installed = opendir(KISS_INSTALLED)) == NULL)
+        die("couldn't open choices database:");
+
+    pkg = readdir(installed);
+
+    /* loop through packages in KISS_INSTALLED */
+    for (; pkg != NULL; pkg = readdir(installed)) {
+        if (strncmp(pkg->d_name, ".", sizeof(".") - 1) == 0)
+            continue;
+
+        c = snprintf(mpath, PATH_LEN, "%s/%s/manifest", KISS_INSTALLED,
+                pkg->d_name);
+
+        if (c >= PATH_LEN) {
+            closedir(installed);
+            die("%s: manifest path for %s too long", __func__, pkg->d_name);
+        }
+
+        if (strlen(pkg->d_name) >= PKG_NAME_MAX) {
+            closedir(installed);
+            die("%s: package name %s too long", __func__, pkg->d_name);
+        }
+
+        if ((mfile = fopen(mpath, "r")) == NULL) {
+            closedir(installed);
+            die("%s: couldn't open manifest for %s", __func__, pkg->d_name);
+        }
+
+        /* loop through lines in manifest file */
+        while (fgets(line, 512, mfile)) {
+            if ((p = strrchr(line, '\n')) == NULL) {
+                fclose(mfile);
+                closedir(installed);
+                die("%s: manifest line too long for %s", __func__,
+                        pkg->d_name);
+            }
+
+            *p = '\0';
+
+            /* path is present in this manifest */
+            if (strcmp(path, line) == 0) {
+                fclose(mfile);
+                strncpy(owner, pkg->d_name, PKG_NAME_MAX);
+                closedir(installed);
+                return;
+            }
+        }
+
+        fclose(mfile);
+    }
+
+    closedir(installed);
+}
diff --git a/alt.h b/alt.h
@@ -0,0 +1,10 @@
+#define ALT_MAX 256
+#define KISS_CHOICES "/var/db/kiss/choices"
+
+struct alt_t {
+    char name[PKG_NAME_MAX];
+    char path[PATH_LEN];
+};
+
+void alt_load();
+void alt_owner(char owner[PKG_NAME_MAX], char *path);