extend api to be able to get a full error string instead of printing it

diff --git a/libuci.c b/libuci.c
index 1cfe4ec..29dab12 100644 (file)
--- a/libuci.c
+++ b/libuci.c
@@ -130,9 +130,24 @@ static void uci_cleanup(struct uci_context *ctx)
        free(pctx);
 }
 
-void uci_perror(struct uci_context *ctx, const char *prefix)
+void
+uci_perror(struct uci_context *ctx, const char *str)
 {
+       uci_get_errorstr(ctx, NULL, str);
+}
+
+void
+uci_get_errorstr(struct uci_context *ctx, char **dest, const char *prefix)
+{
+       static char error_info[128];
        int err;
+       const char *format =
+               "%s%s" /* prefix */
+               "%s%s" /* function */
+               "%s" /* error */
+               "%s\n"; /* details */
+
+       error_info[0] = 0;
 
        if (!ctx)
                err = UCI_ERR_INVAL;
@@ -142,22 +157,28 @@ void uci_perror(struct uci_context *ctx, const char *prefix)
        if ((err < 0) || (err >= UCI_ERR_LAST))
                err = UCI_ERR_UNKNOWN;
 
-       if (prefix)
-               fprintf(stderr, "%s: ", prefix);
-       if (ctx->func)
-               fprintf(stderr, "%s: ", ctx->func);
-
        switch (err) {
        case UCI_ERR_PARSE:
                if (ctx->pctx) {
-                       fprintf(stderr, "%s (%s) at line %d, byte %d\n", uci_errstr[err], (ctx->pctx->reason ? ctx->pctx->reason : "unknown"), ctx->pctx->line, ctx->pctx->byte);
+                       snprintf(error_info, sizeof(error_info), " (%s) at line %d, byte %d", (ctx->pctx->reason ? ctx->pctx->reason : "unknown"), ctx->pctx->line, ctx->pctx->byte);
                        break;
                }
-               /* fall through */
+               break;
        default:
-               fprintf(stderr, "%s\n", uci_errstr[err]);
                break;
        }
+       if (dest)
+               asprintf(dest, format,
+                       (prefix ? prefix : ""), (prefix ? ": " : ""),
+                       (ctx->func ? ctx->func : ""), (ctx->func ? ": " : ""),
+                       uci_errstr[err],
+                       error_info);
+       else
+               fprintf(stderr, format,
+                       (prefix ? prefix : ""), (prefix ? ": " : ""),
+                       (ctx->func ? ctx->func : ""), (ctx->func ? ": " : ""),
+                       uci_errstr[err],
+                       error_info);
 }
 
 int uci_list_configs(struct uci_context *ctx, char ***list)

diff --git a/uci.h b/uci.h
index 66ad752..d48ea7c 100644 (file)
--- a/uci.h
+++ b/uci.h
@@ -84,6 +84,16 @@ extern void uci_free_context(struct uci_context *ctx);
 extern void uci_perror(struct uci_context *ctx, const char *str);
 
 /**
+ * uci_geterror: Get an error string for the last uci error
+ * @ctx: uci context
+ * @dest: target pointer for the string
+ * @str: prefix for the error message
+ *
+ * Note: string must be freed by the caller
+ */
+extern void uci_get_errorstr(struct uci_context *ctx, char **dest, const char *str);
+
+/**
  * uci_import: Import uci config data from a stream
  * @ctx: uci context
  * @stream: file stream to import from