Reorg a bit, introduce a control struct

1 files changed, 182 insertions, 0 deletions

diff --git a/conf.c b/conf.c
new file mode 100644
index 0000000..5aedc6e
--- /dev/null
+++ b/conf.c
@@ -0,0 +1,182 @@
+#include <ctype.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "conf.h"
+#include "util.h"
+
+static size_t strtrim(char *str) {
+  char *left = str, *right;
+
+  if (!str || *str == '\0') {
+    return 0;
+  }
+
+  while (isspace((unsigned char)*left)) {
+    left++;
+  }
+  if (left != str) {
+    memmove(str, left, (strlen(left) + 1));
+    left = str;
+  }
+
+  if (*str == '\0') {
+    return 0;
+  }
+
+  right = strchr(str, '\0') - 1;
+  while (isspace((unsigned char)*right)) {
+    right--;
+  }
+  *++right = '\0';
+
+  return right - left;
+}
+
+int is_section(const char *s, int n) {
+  return s[0] == '[' && s[n-1] == ']';
+}
+
+static int config_add_repo(config_t *config, char *reponame) {
+  /* first time setup */
+  if (config->repos == NULL) {
+    config->repos = calloc(10, sizeof(char*));
+    if (config->repos == NULL) {
+      return -ENOMEM;
+    }
+
+    config->size = 0;
+    config->capacity = 10;
+  }
+
+  /* grow when needed */
+  if (config->size == config->capacity) {
+    void *ptr;
+
+    ptr = realloc(config->repos, config->capacity * 2.5 * sizeof(char*));
+    if (ptr == NULL) {
+      return -ENOMEM;
+    }
+
+    config->repos = ptr;
+  }
+
+  config->repos[config->size] = strdup(reponame);
+  ++config->size;
+
+  return 0;
+}
+
+static int parse_one_file(config_t *config, const char *filename, char **section);
+
+static int parse_include(config_t *config, const char *include, char **section) {
+  _cleanup_(globfreep) glob_t globbuf = {};
+
+  if (glob(include, GLOB_NOCHECK, NULL, &globbuf) != 0) {
+    fprintf(stderr, "warning: globbing failed on '%s': out of memory\n",
+            include);
+    return -ENOMEM;
+  }
+
+  for (size_t i = 0; i < globbuf.gl_pathc; ++i) {
+    int r;
+    r = parse_one_file(config, globbuf.gl_pathv[i], section);
+    if (r < 0)
+      return r;
+  }
+
+  return 0;
+}
+
+static char *split_keyval(char *line, const char *sep) {
+  strsep(&line, sep);
+  return line;
+}
+
+static int parse_one_file(config_t *config, const char *filename, char **section) {
+  _cleanup_(fclosep) FILE *fp = NULL;
+  _cleanup_free_ char *line = NULL;
+  size_t n = 0;
+  int in_options = 0;
+
+  if (*section)
+    in_options = strcmp(*section, "options") == 0;
+
+  fp = fopen(filename, "r");
+  if (fp == NULL)
+    return -errno;
+
+  for (;;) {
+    ssize_t len;
+
+    errno = 0;
+    len = getline(&line, &n, fp);
+    if (len < 0) {
+      if (errno != 0)
+        return -errno;
+
+      /* EOF */
+      break;
+    }
+
+    len = strtrim(line);
+    if (len == 0 || line[0] == '#')
+      continue;
+
+    if (is_section(line, len)) {
+      free(*section);
+      *section = strndup(&line[1], len - 2);
+      if (*section == NULL)
+        return -ENOMEM;
+
+      in_options = strcmp(*section, "options") == 0;
+      if (!in_options) {
+        int r;
+
+        r = config_add_repo(config, *section);
+        if (r < 0)
+          return r;
+
+      }
+      continue;
+    }
+
+    if (in_options && memchr(line, '=', len)) {
+      char *val;
+
+      val = split_keyval(line, "=");
+      strtrim(line);
+
+      if (strcmp(line, "Include") == 0) {
+        int k;
+
+        strtrim(val);
+
+        k = parse_include(config, val, section);
+        if (k < 0)
+          return k;
+      }
+    }
+  }
+
+  return 0;
+}
+
+void config_reset(config_t *config) {
+  if (config == NULL)
+    return;
+
+  for (int i = 0; i < config->size; ++i)
+    free(config->repos[i]);
+
+  free(config->repos);
+}
+
+int config_parse(config_t *config, const char *filename) {
+  _cleanup_free_ char *section = NULL;
+
+  return parse_one_file(config, filename, &section);
+}
+
+/* vim: set et ts=2 sw=2: */