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69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <stdarg.h>
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#include "jv_alloc.h"
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#include "locfile.h"
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void locfile_init(struct locfile* l, const char* data, int length) {
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l->data = data;
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l->length = length;
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l->nlines = 1;
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for (int i=0; i<length; i++) {
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if (data[i] == '\n') l->nlines++;
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}
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l->linemap = jv_mem_alloc(sizeof(int) * (l->nlines + 1));
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l->linemap[0] = 0;
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int line = 1;
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for (int i=0; i<length; i++) {
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if (data[i] == '\n') {
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l->linemap[line] = i;
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line++;
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}
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}
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l->linemap[l->nlines] = length;
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}
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void locfile_free(struct locfile* l) {
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jv_mem_free(l->linemap);
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}
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static int locfile_get_line(struct locfile* l, int pos) {
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assert(pos < l->length);
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int line = 0;
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while (l->linemap[line+1] < pos) line++;
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assert(line < l->nlines);
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return line;
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}
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static int locfile_line_length(struct locfile* l, int line) {
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assert(line < l->nlines);
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return l->linemap[line+1] - l->linemap[line];
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}
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void locfile_locate(struct locfile* l, location loc, const char* fmt, ...) {
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va_list fmtargs;
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va_start(fmtargs, fmt);
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vfprintf(stderr, fmt, fmtargs);
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va_end(fmtargs);
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fprintf(stderr, "\n");
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if (loc.start == -1) {
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fprintf(stderr, "<unknown location>\n");
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return;
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}
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int startline = locfile_get_line(l, loc.start);
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int offset = l->linemap[startline];
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fprintf(stderr, "HERE1\n%.*s\n", locfile_line_length(l, startline)-(startline!=0), l->data + offset +(startline!=0)); // if not first line, this starts at the '\n' in l
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fprintf(stderr, "HERE2\n%*s", loc.start - offset -(startline!=0), ""); // space padding. If not first line, offset is the '\n' at beginning of line, and one too many
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/* ASIDE: because all this code is in locfile.h instead of locfile.c, it recompiles everything, and takes forever */
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/* I've separated it out, into locfile.h; removed static */
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/* Problem: a few files include locfile.h to get the *.h it includes... this seems bad to me */
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for (int i = loc.start;
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i < loc.end && i < offset + locfile_line_length(l, startline);
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i++){
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fprintf(stderr, "^");
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}
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fprintf(stderr, "\n");
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}
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