created lib-app skeleton (foss21.org lib-app model).

1 files changed, 230 insertions, 0 deletions

diff --git a/src/output/tpax_output_error.c b/src/output/tpax_output_error.c
new file mode 100644
index 0000000..69c4938
--- /dev/null
+++ b/src/output/tpax_output_error.c
@@ -0,0 +1,230 @@
+/******************************************************/
+/*  tpax: a topological pax implementation            */
+/*  Copyright (C) 2020  Z. Gilboa                     */
+/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */
+/******************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <tpax/tpax.h>
+
+#include "tpax_driver_impl.h"
+#include "tpax_dprintf_impl.h"
+
+static const char aclr_reset[]   = "\x1b[0m";
+static const char aclr_bold[]    = "\x1b[1m";
+
+static const char aclr_red[]     = "\x1b[31m";
+static const char aclr_green[]   = "\x1b[32m";
+static const char aclr_blue[]    = "\x1b[34m";
+static const char aclr_magenta[] = "\x1b[35m";
+
+static const char * const tpax_error_strings[TPAX_ERR_CAP] = {
+	[TPAX_ERR_FLOW_ERROR]      = "flow error: unexpected condition or other",
+	[TPAX_ERR_FLEE_ERROR]      = "flees and bugs and cats and mice",
+	[TPAX_ERR_NULL_CONTEXT]    = "null driver or unit context",
+	[TPAX_ERR_BAD_DATA]        = "corrupt or wrong daata",
+};
+
+static const char * tpax_output_error_header(const struct tpax_error_info * erri)
+{
+	if (erri->eflags & TPAX_ERROR_CHILD)
+		return "exec error upon";
+
+	else if (erri->eflags & TPAX_ERROR_TOP_LEVEL)
+		return "error logged in";
+
+	else if (erri->eflags & TPAX_ERROR_NESTED)
+		return "< returned to >";
+
+	else
+		return "distorted state";
+}
+
+static const char * tpax_output_unit_header(const struct tpax_error_info * erri)
+{
+	if (!(erri->eflags & TPAX_ERROR_CUSTOM))
+		return "while opening";
+
+	else
+		return "while parsing";
+}
+
+static const char * tpax_output_strerror(
+	const struct tpax_error_info * erri,
+	char (*errbuf)[256])
+{
+	if (erri->eflags & TPAX_ERROR_CUSTOM)
+		return ((erri->elibcode < 0) || (erri->elibcode >= TPAX_ERR_CAP))
+			? "internal error: please report to the maintainer"
+			: tpax_error_strings[erri->elibcode];
+
+	else if (erri->eflags & TPAX_ERROR_NESTED)
+		return "";
+
+	else if (erri->eflags & TPAX_ERROR_CHILD)
+		return "(see child process error messages)";
+
+	else if (erri->esyscode == ENOBUFS)
+		return "input error: string length exceeds buffer size";
+
+	else
+		return strerror_r(erri->esyscode,*errbuf,sizeof(*errbuf))
+			? "internal error: strerror_r(3) call failed"
+			: *errbuf;
+
+}
+
+static int tpax_output_error_record_plain(
+	const struct tpax_driver_ctx *	dctx,
+	const struct tpax_error_info *	erri)
+{
+	const char * epath;
+	char         errbuf[256];
+
+	int          fderr   = tpax_driver_fderr(dctx);
+	const char * errdesc = tpax_output_strerror(erri,&errbuf);
+
+	epath = erri->euctx
+		? *erri->euctx->path
+		: erri->eunit;
+
+	if (epath && !(erri->eflags & TPAX_ERROR_NESTED))
+		if (tpax_dprintf(
+				fderr,
+				"%s: [%s] '%s':\n",
+				dctx->program,
+				tpax_output_unit_header(erri),
+				epath) < 0)
+			return -1;
+
+	if (tpax_dprintf(
+			fderr,
+			"%s: %s %s(), line %d%s%s.\n",
+			dctx->program,
+			tpax_output_error_header(erri),
+			erri->efunction,
+			erri->eline,
+			strlen(errdesc) ? ": " : "",
+			errdesc) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int tpax_output_error_record_annotated(
+	const struct tpax_driver_ctx *	dctx,
+	const struct tpax_error_info *	erri)
+{
+	const char * epath;
+	char         errbuf[256];
+
+	int          fderr   = tpax_driver_fderr(dctx);
+	const char * errdesc = tpax_output_strerror(erri,&errbuf);
+
+	epath = erri->euctx
+		? *erri->euctx->path
+		: erri->eunit;
+
+	if (epath && !(erri->eflags & TPAX_ERROR_NESTED))
+		if (tpax_dprintf(
+				fderr,
+				"%s%s%s:%s %s[%s]%s %s%s'%s'%s:\n",
+
+				aclr_bold,aclr_magenta,
+				dctx->program,
+				aclr_reset,
+
+				aclr_bold,
+				tpax_output_unit_header(erri),
+				aclr_reset,
+
+				aclr_bold,aclr_red,
+				epath,
+				aclr_reset) < 0)
+			return -1;
+
+	if (tpax_dprintf(
+			fderr,
+			"%s%s%s:%s %s%s%s %s%s%s()%s, %s%sline %d%s%s%s%s%s.\n",
+
+			aclr_bold,aclr_magenta,
+			dctx->program,
+			aclr_reset,
+
+			aclr_bold,
+			tpax_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) < 0)
+		return -1;
+
+	return 0;
+}
+
+int tpax_output_error_record(
+	const struct tpax_driver_ctx *	dctx,
+	const struct tpax_error_info *	erri)
+{
+	if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_NEVER)
+		return tpax_output_error_record_plain(dctx,erri);
+
+	else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS)
+		return tpax_output_error_record_annotated(dctx,erri);
+
+	else if (isatty(tpax_driver_fderr(dctx)))
+		return tpax_output_error_record_annotated(dctx,erri);
+
+	else
+		return tpax_output_error_record_plain(dctx,erri);
+}
+
+static int tpax_output_error_vector_plain(const struct tpax_driver_ctx * dctx)
+{
+	struct tpax_error_info ** perr;
+
+	for (perr=dctx->errv; *perr; perr++)
+		if (tpax_output_error_record_plain(dctx,*perr))
+			return -1;
+
+	return 0;
+}
+
+static int tpax_output_error_vector_annotated(const struct tpax_driver_ctx * dctx)
+{
+	struct tpax_error_info ** perr;
+
+	for (perr=dctx->errv; *perr; perr++)
+		if (tpax_output_error_record_annotated(dctx,*perr))
+			return -1;
+
+	return 0;
+}
+
+int tpax_output_error_vector(const struct tpax_driver_ctx * dctx)
+{
+	if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_NEVER)
+		return tpax_output_error_vector_plain(dctx);
+
+	else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS)
+		return tpax_output_error_vector_annotated(dctx);
+
+	else if (isatty(tpax_driver_fderr(dctx)))
+		return tpax_output_error_vector_annotated(dctx);
+
+	else
+		return tpax_output_error_vector_plain(dctx);
+}