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/* Generated by re2c */ #line 1 "c/fill/02_fill.re" // re2c $INPUT -o $OUTPUT #include <assert.h> #include <stdio.h> #include <string.h> #line 9 "c/fill/02_fill.c" #define YYMAXFILL 1 #line 6 "c/fill/02_fill.re" #define BUFSIZE (4096 - YYMAXFILL) struct Input { FILE *file; char buf[BUFSIZE + YYMAXFILL], *lim, *cur, *tok; bool eof; }; static int fill(Input &in, size_t need) { if (in.eof) return 1; const size_t shift = in.tok - in.buf; const size_t used = in.lim - in.tok; // Error: lexeme too long. In real life could reallocate a larger buffer. if (shift < need) return 2; // Shift buffer contents (discard everything up to the current token). memmove(in.buf, in.tok, used); in.lim -= shift; in.cur -= shift; in.tok -= shift; // Fill free space at the end of buffer with new data from file. in.lim += fread(in.lim, 1, BUFSIZE - used, in.file); // If read less than expected, this is end of input => add zero padding // so that the lexer can access characters at the end of buffer. if (in.lim < in.buf + BUFSIZE) { in.eof = true; memset(in.lim, 0, YYMAXFILL); in.lim += YYMAXFILL; } return 0; } static int lex(Input &in) { int count = 0; for (;;) { in.tok = in.cur; #line 55 "c/fill/02_fill.c" { char yych; if (in.lim <= in.cur) if (fill(in, 1) != 0) return -1; yych = *in.cur; switch (yych) { case 0x00: goto yy1; case ' ': goto yy3; case '\'': goto yy5; default: goto yy2; } yy1: ++in.cur; #line 57 "c/fill/02_fill.re" { // Check that it is the sentinel, not some unexpected null. return in.tok == in.lim - YYMAXFILL ? count : -1; } #line 73 "c/fill/02_fill.c" yy2: ++in.cur; #line 63 "c/fill/02_fill.re" { return -1; } #line 78 "c/fill/02_fill.c" yy3: ++in.cur; if (in.lim <= in.cur) if (fill(in, 1) != 0) return -1; yych = *in.cur; switch (yych) { case ' ': goto yy3; default: goto yy4; } yy4: #line 62 "c/fill/02_fill.re" { continue; } #line 90 "c/fill/02_fill.c" yy5: ++in.cur; if (in.lim <= in.cur) if (fill(in, 1) != 0) return -1; yych = *in.cur; switch (yych) { case '\'': goto yy6; case '\\': goto yy7; default: goto yy5; } yy6: ++in.cur; #line 61 "c/fill/02_fill.re" { ++count; continue; } #line 104 "c/fill/02_fill.c" yy7: ++in.cur; if (in.lim <= in.cur) if (fill(in, 1) != 0) return -1; goto yy5; } #line 64 "c/fill/02_fill.re" } } int main() { const char *fname = "input"; const char content[] = "'qu\0tes' 'are' 'fine: \\'' "; // Prepare input file: a few times the size of the buffer, containing // strings with zeroes and escaped quotes. FILE *f = fopen(fname, "w"); for (int i = 0; i < BUFSIZE; ++i) { fwrite(content, 1, sizeof(content) - 1, f); } fclose(f); int count = 3 * BUFSIZE; // number of quoted strings written to file // Initialize lexer state: all pointers are at the end of buffer. // This immediately triggers YYFILL, as the check `in.cur < in.lim` fails. Input in; in.file = fopen(fname, "r"); in.cur = in.tok = in.lim = in.buf + BUFSIZE; in.eof = 0; // Run the lexer. assert(lex(in) == count); // Cleanup: remove input file. fclose(in.file); remove(fname); return 0; }