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Diffstat (limited to 'util/qemu-error.c')
| -rw-r--r-- | util/qemu-error.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/util/qemu-error.c b/util/qemu-error.c new file mode 100644 index 0000000..08a36f4 --- /dev/null +++ b/util/qemu-error.c @@ -0,0 +1,215 @@ +/* + * Error reporting + * + * Copyright (C) 2010 Red Hat Inc. + * + * Authors: + * Markus Armbruster <armbru@redhat.com>, + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include <stdio.h> +#include "monitor/monitor.h" + +/* + * Print to current monitor if we have one, else to stderr. + * TODO should return int, so callers can calculate width, but that + * requires surgery to monitor_vprintf(). Left for another day. + */ +void error_vprintf(const char *fmt, va_list ap) +{ + if (cur_mon) { + monitor_vprintf(cur_mon, fmt, ap); + } else { + vfprintf(stderr, fmt, ap); + } +} + +/* + * Print to current monitor if we have one, else to stderr. + * TODO just like error_vprintf() + */ +void error_printf(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + error_vprintf(fmt, ap); + va_end(ap); +} + +void error_printf_unless_qmp(const char *fmt, ...) +{ + va_list ap; + + if (!monitor_cur_is_qmp()) { + va_start(ap, fmt); + error_vprintf(fmt, ap); + va_end(ap); + } +} + +static Location std_loc = { + .kind = LOC_NONE +}; +static Location *cur_loc = &std_loc; + +/* + * Push location saved in LOC onto the location stack, return it. + * The top of that stack is the current location. + * Needs a matching loc_pop(). + */ +Location *loc_push_restore(Location *loc) +{ + assert(!loc->prev); + loc->prev = cur_loc; + cur_loc = loc; + return loc; +} + +/* + * Initialize *LOC to "nowhere", push it onto the location stack. + * The top of that stack is the current location. + * Needs a matching loc_pop(). + * Return LOC. + */ +Location *loc_push_none(Location *loc) +{ + loc->kind = LOC_NONE; + loc->prev = NULL; + return loc_push_restore(loc); +} + +/* + * Pop the location stack. + * LOC must be the current location, i.e. the top of the stack. + */ +Location *loc_pop(Location *loc) +{ + assert(cur_loc == loc && loc->prev); + cur_loc = loc->prev; + loc->prev = NULL; + return loc; +} + +/* + * Save the current location in LOC, return LOC. + */ +Location *loc_save(Location *loc) +{ + *loc = *cur_loc; + loc->prev = NULL; + return loc; +} + +/* + * Change the current location to the one saved in LOC. + */ +void loc_restore(Location *loc) +{ + Location *prev = cur_loc->prev; + assert(!loc->prev); + *cur_loc = *loc; + cur_loc->prev = prev; +} + +/* + * Change the current location to "nowhere in particular". + */ +void loc_set_none(void) +{ + cur_loc->kind = LOC_NONE; +} + +/* + * Change the current location to argument ARGV[IDX..IDX+CNT-1]. + */ +void loc_set_cmdline(char **argv, int idx, int cnt) +{ + cur_loc->kind = LOC_CMDLINE; + cur_loc->num = cnt; + cur_loc->ptr = argv + idx; +} + +/* + * Change the current location to file FNAME, line LNO. + */ +void loc_set_file(const char *fname, int lno) +{ + assert (fname || cur_loc->kind == LOC_FILE); + cur_loc->kind = LOC_FILE; + cur_loc->num = lno; + if (fname) { + cur_loc->ptr = fname; + } +} + +static const char *progname; + +/* + * Set the program name for error_print_loc(). + */ +void error_set_progname(const char *argv0) +{ + const char *p = strrchr(argv0, '/'); + progname = p ? p + 1 : argv0; +} + +const char *error_get_progname(void) +{ + return progname; +} + +/* + * Print current location to current monitor if we have one, else to stderr. + */ +void error_print_loc(void) +{ + const char *sep = ""; + int i; + const char *const *argp; + + if (!cur_mon && progname) { + fprintf(stderr, "%s:", progname); + sep = " "; + } + switch (cur_loc->kind) { + case LOC_CMDLINE: + argp = cur_loc->ptr; + for (i = 0; i < cur_loc->num; i++) { + error_printf("%s%s", sep, argp[i]); + sep = " "; + } + error_printf(": "); + break; + case LOC_FILE: + error_printf("%s:", (const char *)cur_loc->ptr); + if (cur_loc->num) { + error_printf("%d:", cur_loc->num); + } + error_printf(" "); + break; + default: + error_printf("%s", sep); + } +} + +/* + * Print an error message to current monitor if we have one, else to stderr. + * Format arguments like sprintf(). The result should not contain + * newlines. + * Prepend the current location and append a newline. + * It's wrong to call this in a QMP monitor. Use qerror_report() there. + */ +void error_report(const char *fmt, ...) +{ + va_list ap; + + error_print_loc(); + va_start(ap, fmt); + error_vprintf(fmt, ap); + va_end(ap); + error_printf("\n"); +} |