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Add a new func_trace builtin #125

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Add a new func_trace builtin #125

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38 changes: 38 additions & 0 deletions src/function.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1088,6 +1088,43 @@ func_error (char *o, char **argv, const char *funcname)
return o;
}

/*
Print its argument and return it.
*/
static char *
func_trace (char *o, char **argv, const char *funcname)
{
char **argvp;
char *msg, *p;
size_t len;

/* The arguments will be broken on commas. Rather than create yet
another special case where function arguments aren't broken up,
just create a format string that puts them back together. */
for (len=0, argvp=argv; *argvp != 0; ++argvp)
len += strlen (*argvp) + 2;

p = msg = alloca (len + 1);
msg[0] = '\0';

for (argvp=argv; argvp[1] != 0; ++argvp)
{
strcpy (p, *argvp);
p += strlen (*argvp);
*(p++) = ',';
*(p++) = ' ';
}
strcpy (p, *argvp);

outputs (0, msg);
outputs (0, "\n");

o = variable_buffer_output (o, msg, len); // Not sure if len is correct

/* The warning function expands to the empty string. */
return o;
}


/*
chop argv[0] into words, and sort them.
Expand Down Expand Up @@ -2203,6 +2240,7 @@ static struct function_table_entry function_table_init[] =
FT_ENTRY ("info", 0, 1, 1, func_error),
FT_ENTRY ("error", 0, 1, 1, func_error),
FT_ENTRY ("warning", 0, 1, 1, func_error),
FT_ENTRY ("trace", 0, 1, 1, func_trace),
FT_ENTRY ("if", 2, 3, 0, func_if),
FT_ENTRY ("or", 1, 0, 0, func_or),
FT_ENTRY ("and", 1, 0, 0, func_and),
Expand Down