cfgfile: support runtime modification

[dpdk.git] / lib / librte_cfgfile / rte_cfgfile.c

diff --git a/lib/librte_cfgfile/rte_cfgfile.c b/lib/librte_cfgfile/rte_cfgfile.c
index 39f61e5..ad9bb2e 100644 (file)
--- a/lib/librte_cfgfile/rte_cfgfile.c
+++ b/lib/librte_cfgfile/rte_cfgfile.c
@@ -120,6 +120,36 @@ _get_section(struct rte_cfgfile *cfg, const char *sectionname)
        return NULL;
 }
 
+static int
+_add_entry(struct rte_cfgfile_section *section, const char *entryname,
+               const char *entryvalue)
+{
+       /* resize entry structure if we don't have room for more entries */
+       if (section->num_entries == section->allocated_entries) {
+               struct rte_cfgfile_entry *n_entries = realloc(
+                               section->entries,
+                               sizeof(struct rte_cfgfile_entry) *
+                               ((section->allocated_entries) +
+                                               CFG_ALLOC_ENTRY_BATCH));
+
+               if (n_entries == NULL)
+                       return -ENOMEM;
+
+               section->entries = n_entries;
+               section->allocated_entries += CFG_ALLOC_ENTRY_BATCH;
+       }
+       /* fill up entry fields with key name and value */
+       struct rte_cfgfile_entry *curr_entry =
+                                       &section->entries[section->num_entries];
+
+       snprintf(curr_entry->name, sizeof(curr_entry->name), "%s", entryname);
+       snprintf(curr_entry->value,
+                               sizeof(curr_entry->value), "%s", entryvalue);
+       section->num_entries++;
+
+       return 0;
+}
+
 static int
 rte_cfgfile_check_params(const struct rte_cfgfile_parameters *params)
 {
@@ -346,6 +376,162 @@ error2:
        return NULL;
 }
 
+struct rte_cfgfile *
+rte_cfgfile_create(int flags)
+{
+       int i;
+       struct rte_cfgfile *cfg = NULL;
+
+       cfg = malloc(sizeof(*cfg));
+
+       if (cfg == NULL)
+               return NULL;
+
+       cfg->flags = flags;
+       cfg->num_sections = 0;
+
+       /* allocate first batch of sections and entries */
+       cfg->sections = malloc(sizeof(struct rte_cfgfile_section) *
+                       CFG_ALLOC_SECTION_BATCH);
+
+       if (cfg->sections == NULL)
+               return NULL;
+
+       cfg->allocated_sections = CFG_ALLOC_SECTION_BATCH;
+
+       for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
+               cfg->sections[i].entries = malloc(sizeof(
+                       struct rte_cfgfile_entry) * CFG_ALLOC_ENTRY_BATCH);
+
+               if (cfg->sections[i].entries == NULL)
+                       return NULL;
+
+               cfg->sections[i].num_entries = 0;
+               cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
+       }
+
+       if (flags & CFG_FLAG_GLOBAL_SECTION)
+               rte_cfgfile_add_section(cfg, "GLOBAL");
+       return cfg;
+}
+
+int
+rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
+{
+       int i;
+
+       if (cfg == NULL)
+               return -EINVAL;
+
+       if (sectionname == NULL)
+               return -EINVAL;
+
+       /* resize overall struct if we don't have room for more sections */
+       if (cfg->num_sections == cfg->allocated_sections) {
+
+               struct rte_cfgfile_section *n_sections =
+                               realloc(cfg->sections,
+                               sizeof(struct rte_cfgfile_section) *
+                               ((cfg->allocated_sections) +
+                               CFG_ALLOC_SECTION_BATCH));
+
+               if (n_sections == NULL)
+                       return -ENOMEM;
+
+               for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
+                       n_sections[i + cfg->allocated_sections].num_entries = 0;
+                       n_sections[i +
+                                cfg->allocated_sections].allocated_entries = 0;
+                       n_sections[i + cfg->allocated_sections].entries = NULL;
+               }
+               cfg->sections = n_sections;
+               cfg->allocated_sections += CFG_ALLOC_SECTION_BATCH;
+       }
+
+       snprintf(cfg->sections[cfg->num_sections].name,
+                       sizeof(cfg->sections[0].name), "%s", sectionname);
+       cfg->sections[cfg->num_sections].num_entries = 0;
+       cfg->num_sections++;
+
+       return 0;
+}
+
+int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
+               const char *sectionname, const char *entryname,
+               const char *entryvalue)
+{
+       int ret;
+
+       if ((cfg == NULL) || (sectionname == NULL) || (entryname == NULL)
+                       || (entryvalue == NULL))
+               return -EINVAL;
+
+       if (rte_cfgfile_has_entry(cfg, sectionname, entryname) != 0)
+               return -EEXIST;
+
+       /* search for section pointer by sectionname */
+       struct rte_cfgfile_section *curr_section = _get_section(cfg,
+                                                               sectionname);
+       if (curr_section == NULL)
+               return -EINVAL;
+
+       ret = _add_entry(curr_section, entryname, entryvalue);
+
+       return ret;
+}
+
+int rte_cfgfile_set_entry(struct rte_cfgfile *cfg, const char *sectionname,
+               const char *entryname, const char *entryvalue)
+{
+       int i;
+
+       if ((cfg == NULL) || (sectionname == NULL) || (entryname == NULL))
+               return -EINVAL;
+
+       /* search for section pointer by sectionname */
+       struct rte_cfgfile_section *curr_section = _get_section(cfg,
+                                                               sectionname);
+       if (curr_section == NULL)
+               return -EINVAL;
+
+       if (entryvalue == NULL)
+               entryvalue = "";
+
+       for (i = 0; i < curr_section->num_entries; i++)
+               if (!strcmp(curr_section->entries[i].name, entryname)) {
+                       snprintf(curr_section->entries[i].value,
+                                       sizeof(curr_section->entries[i].value),
+                                                       "%s", entryvalue);
+                       return 0;
+               }
+       printf("Error - entry name doesn't exist\n");
+       return -EINVAL;
+}
+
+int rte_cfgfile_save(struct rte_cfgfile *cfg, const char *filename)
+{
+       int i, j;
+
+       if ((cfg == NULL) || (filename == NULL))
+               return -EINVAL;
+
+       FILE *f = fopen(filename, "w");
+
+       if (f == NULL)
+               return -EINVAL;
+
+       for (i = 0; i < cfg->num_sections; i++) {
+               fprintf(f, "[%s]\n", cfg->sections[i].name);
+
+               for (j = 0; j < cfg->sections[i].num_entries; j++) {
+                       fprintf(f, "%s=%s\n",
+                                       cfg->sections[i].entries[j].name,
+                                       cfg->sections[i].entries[j].value);
+               }
+       }
+       return fclose(f);
+}
+
 int rte_cfgfile_close(struct rte_cfgfile *cfg)
 {
        int i;