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-rw-r--r--src/output/tbnf_output_error.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/src/output/tbnf_output_error.c b/src/output/tbnf_output_error.c
new file mode 100644
index 0000000..d607e54
--- /dev/null
+++ b/src/output/tbnf_output_error.c
@@ -0,0 +1,192 @@
+/**************************************************************/
+/* treebnf: a tree oriented bnf library */
+/* Copyright (C) 2024 SysDeer Technologies, LLC */
+/* Released under GPLv2 and GPLv3; see COPYING.TREEBNF. */
+/**************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <treebnf/treebnf.h>
+
+#include "treebnf_driver_impl.h"
+#include "treebnf_dprintf_impl.h"
+
+static const char aclr_reset[] = "\x1b[0m";
+static const char aclr_bold[] = "\x1b[1m";
+
+static const char aclr_green[] = "\x1b[32m";
+static const char aclr_blue[] = "\x1b[34m";
+static const char aclr_magenta[] = "\x1b[35m";
+
+static const char * tbnf_output_error_header(const struct tbnf_error_info * erri)
+{
+ if (erri->eflags & TBNF_ERROR_CHILD)
+ return "exec error upon";
+
+ else if (erri->eflags & TBNF_ERROR_TOP_LEVEL)
+ return "error logged in";
+
+ else if (erri->eflags & TBNF_ERROR_NESTED)
+ return "< returned to >";
+
+ else
+ return "distorted state";
+}
+
+static const char * tbnf_output_strerror(
+ const struct tbnf_error_info * erri,
+ char (*errbuf)[256])
+{
+ if (erri->eflags & TBNF_ERROR_CUSTOM)
+ return "flow error: unexpected condition or other";
+
+ else if (erri->eflags & TBNF_ERROR_NESTED)
+ return "";
+
+ else if (erri->eflags & TBNF_ERROR_CHILD)
+ return "(see child process error messages)";
+
+ else if (erri->esyscode == ENOBUFS)
+ return "input error: string length exceeds buffer size";
+
+ else if ((erri->esyscode == ENOENT) && erri->eany)
+ return "path not found: ";
+
+ else
+ return strerror_r(erri->esyscode,*errbuf,sizeof(*errbuf))
+ ? "internal error: strerror_r(3) call failed"
+ : *errbuf;
+}
+
+static int tbnf_output_error_record_plain(
+ const struct tbnf_driver_ctx * dctx,
+ const struct tbnf_error_info * erri)
+{
+ char errbuf[256];
+
+ int fderr = tbnf_driver_fderr(dctx);
+ const char * errdesc = tbnf_output_strerror(erri,&errbuf);
+ const char * path;
+
+ path = ((erri->esyscode == ENOENT) && erri->eany)
+ ? erri->eany : "";
+
+ if (tbnf_dprintf(
+ fderr,
+ "%s: %s %s(), line %d%s%s%s.\n",
+ dctx->program,
+ tbnf_output_error_header(erri),
+ erri->efunction,
+ erri->eline,
+ strlen(errdesc) ? ": " : "",
+ errdesc,path) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int tbnf_output_error_record_annotated(
+ const struct tbnf_driver_ctx * dctx,
+ const struct tbnf_error_info * erri)
+{
+ char errbuf[256];
+
+ int fderr = tbnf_driver_fderr(dctx);
+ const char * errdesc = tbnf_output_strerror(erri,&errbuf);
+ const char * path;
+
+ path = ((erri->esyscode == ENOENT) && erri->eany)
+ ? erri->eany : "";
+
+ if (tbnf_dprintf(
+ fderr,
+ "%s%s%s:%s %s%s%s %s%s%s()%s, %s%sline %d%s%s%s%s%s%s%s%s%s.\n",
+
+ aclr_bold,aclr_magenta,
+ dctx->program,
+ aclr_reset,
+
+ aclr_bold,
+ tbnf_output_error_header(erri),
+ aclr_reset,
+
+ aclr_bold,aclr_blue,
+ erri->efunction,
+ aclr_reset,
+
+ aclr_bold,aclr_green,
+ erri->eline,
+ aclr_reset,
+ strlen(errdesc) ? ": " : "",
+
+ aclr_bold,
+ errdesc,
+ aclr_reset,
+
+ aclr_bold,aclr_blue,
+ path,
+ aclr_reset) < 0)
+ return -1;
+
+ return 0;
+}
+
+int tbnf_output_error_record(
+ const struct tbnf_driver_ctx * dctx,
+ const struct tbnf_error_info * erri)
+{
+ int fderr = tbnf_driver_fderr(dctx);
+
+ if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_NEVER)
+ return tbnf_output_error_record_plain(dctx,erri);
+
+ else if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_ALWAYS)
+ return tbnf_output_error_record_annotated(dctx,erri);
+
+ else if (isatty(fderr))
+ return tbnf_output_error_record_annotated(dctx,erri);
+
+ else
+ return tbnf_output_error_record_plain(dctx,erri);
+}
+
+static int tbnf_output_error_vector_plain(const struct tbnf_driver_ctx * dctx)
+{
+ struct tbnf_error_info ** perr;
+
+ for (perr=dctx->errv; *perr; perr++)
+ if (tbnf_output_error_record_plain(dctx,*perr))
+ return -1;
+
+ return 0;
+}
+
+static int tbnf_output_error_vector_annotated(const struct tbnf_driver_ctx * dctx)
+{
+ struct tbnf_error_info ** perr;
+
+ for (perr=dctx->errv; *perr; perr++)
+ if (tbnf_output_error_record_annotated(dctx,*perr))
+ return -1;
+
+ return 0;
+}
+
+int tbnf_output_error_vector(const struct tbnf_driver_ctx * dctx)
+{
+ int fderr = tbnf_driver_fderr(dctx);
+
+ if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_NEVER)
+ return tbnf_output_error_vector_plain(dctx);
+
+ else if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_ALWAYS)
+ return tbnf_output_error_vector_annotated(dctx);
+
+ else if (isatty(fderr))
+ return tbnf_output_error_vector_annotated(dctx);
+
+ else
+ return tbnf_output_error_vector_plain(dctx);
+}