Add format string doku, simplify format string handling.

[adu.git] / string.c

diff --git a/string.c b/string.c
index 0b929688a2496d5a5f57c8a9e5590b17dd5d697a..8d1a738b5865fa9d414fe9f2ec7ec05df67700bd 100644 (file)
--- a/string.c
+++ b/string.c
@@ -328,3 +328,116 @@ int parse_uid_arg(const char *orig_arg, struct uid_range **ur)
        (*ur)[n].high = 0;
        return n;
 }
+
+enum line_state_flags {LSF_HAVE_WORD = 1, LSF_BACKSLASH = 2, LSF_QUOTE = 4};
+
+static int get_next_word(const char *line, char **word)
+{
+       const char *in;
+       char *out;
+       int ret, state = 0;
+
+       out = adu_malloc(strlen(line) + 1);
+       *out = '\0';
+       *word = out;
+       for (in = line; *in; in++) {
+               switch (*in) {
+               case '\\':
+                       if (state & LSF_BACKSLASH) /* \\ */
+                               break;
+                       state |= LSF_BACKSLASH;
+                       state |= LSF_HAVE_WORD;
+                       continue;
+               case 'n':
+               case 't':
+                       if (state & LSF_BACKSLASH) { /* \n or \t */
+                               *out++ = (*in == 'n')? '\n' : '\t';
+                               state &= ~LSF_BACKSLASH;
+                               continue;
+                       }
+                       break;
+               case '"':
+                       if (state & LSF_BACKSLASH) /* \" */
+                               break;
+                       if (state & LSF_QUOTE) {
+                               state &= ~LSF_QUOTE;
+                               continue;
+                       }
+                       state |= LSF_HAVE_WORD;
+                       state |= LSF_QUOTE;
+                       continue;
+               case ' ':
+               case '\t':
+               case '\n':
+                       if (state & LSF_BACKSLASH)
+                               break;
+                       if (state & LSF_QUOTE)
+                               break;
+                       if (state & LSF_HAVE_WORD)
+                               goto success;
+                       /* ignore space at the beginning */
+                       continue;
+               }
+               /* copy char */
+               state |= LSF_HAVE_WORD;
+               *out++ = *in;
+               state &= ~LSF_BACKSLASH;
+       }
+       ret = 0;
+       if (!(state & LSF_HAVE_WORD))
+               goto out;
+       ret = -ERRNO_TO_ERROR(EINVAL);
+       if (state & LSF_BACKSLASH) {
+               ERROR_LOG("trailing backslash\n");
+               goto out;
+       }
+       if (state & LSF_QUOTE) {
+               ERROR_LOG("unmatched quote character\n");
+               goto out;
+       }
+success:
+       *out = '\0';
+       return in - line;
+out:
+       free(*word);
+       *word = NULL;
+       return ret;
+}
+
+void free_argv(char **argv)
+{
+       int i;
+
+       for (i = 0; argv[i]; i++)
+               free(argv[i]);
+       free(argv);
+}
+
+/**
+ * \return Number of words in \a line, negative on errors.
+ */
+int create_argv(const char *line, char ***result)
+{
+       char *word, **argv = adu_malloc(2 * sizeof(char *));
+       const char *p;
+       int ret, num_words;
+
+       argv[0] = adu_strdup(line);
+       for (p = line, num_words = 1; ; p += ret, num_words++) {
+               ret = get_next_word(p, &word);
+               if (ret < 0)
+                       goto err;
+               if (!ret)
+                       break;
+               argv = adu_realloc(argv, (num_words + 2) * sizeof(char*));
+               argv[num_words] = word;
+       }
+       argv[num_words] = NULL;
+       *result = argv;
+       return num_words;
+err:
+       while (num_words > 0)
+               free(argv[--num_words]);
+       free(argv);
+       return ret;
+}