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#include <stdarg.h>
#include <string.h>
#include <posthaste/debug.h>
/**
* Find position in file buffer where line number \p no
* starts. Lines are assumed to be one-indexed, with
* \p no = \c 0 and \p no = \c 1 both considered the first line.
*
* @param buf Buffer to look in.
* @param no Line number whose start to look for.
* @return Pointer to location in buffer where line number \p no
* starts.
*/
static const char *find_lineno(const char *buf, size_t no)
{
if (no == 0 || no == 1)
return buf;
char c;
while ((c = *buf)) {
buf++;
if (c == '\n')
no--;
if (no == 1)
break;
}
return buf;
}
void vsrc_issue(struct src_issue issue, const char *msg, va_list args)
{
const char *line_start = find_lineno(issue.buf, issue.loc.first_line);
const char *line_end = strchr(line_start, '\n');
if (!line_end)
line_end = strchr(line_start, 0);
int line_len = line_end - line_start;
fprintf(stderr, "%s:%i:%i: ", issue.fname,
issue.loc.first_line,
issue.loc.first_col);
vfprintf(stderr, msg, args);
fputc('\n', stderr);
int lineno_len = snprintf(NULL, 0, "%i", issue.loc.first_line);
fputc(' ', stderr);
fprintf(stderr, "%i | ", issue.loc.first_line);
fprintf(stderr, "%.*s\n", line_len, line_start);
for (int i = 0; i < lineno_len + 2; ++i)
fputc(' ', stderr);
fprintf(stderr, "| ");
for (int i = 0; i < issue.loc.first_col - 1; ++i)
fputc(line_start[i] == '\t' ? '\t' : ' ', stderr);
for (int i = issue.loc.first_col; i < issue.loc.last_col; ++i) {
if (i == issue.loc.first_col)
fputc('^', stderr);
else
fputc('~', stderr);
}
fputc('\n', stderr);
}
void src_issue(struct src_issue issue, const char *msg, ...)
{
va_list args;
va_start(args, msg);
vsrc_issue(issue, msg, args);
va_end(args);
}
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