smu: Change file reading
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95265603BD36E66C
1 changed files with 100 additions and 65 deletions
157
smu.c
157
smu.c
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@ -1,60 +1,61 @@
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/* smu - simple markup
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* Copyright (C) <2007, 2008> Enno Boland <g s01 de>
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* Copyright (C) 2025 Enno Tensing <tenno+smu@suij.in>
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*
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* See LICENSE for further informations
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*/
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#define _LARGEFILE64_SOURCE
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <errno.h>
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#define LENGTH(x) sizeof(x) / sizeof(x[0])
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#define ADDC(b, i) \
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#define ADDC(b, i, a) \
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do { \
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if (i % BUFSIZ == 0) { \
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b = realloc(b, (i + BUFSIZ) * sizeof(char)); \
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if (!b) \
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if (!b) { \
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eprint("Malloc failed."); \
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return -1; \
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} \
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b[i]
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} \
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b[i] = a; \
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} while (0)
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typedef int (*Parser)(const char *, const char *, int);
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typedef struct {
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struct tag {
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char *search;
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int process;
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char *before, *after;
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} Tag;
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char *before;
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char *after;
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};
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static int doamp(const char *begin, const char *end,
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int newblock); /* Parser for & */
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static int docomment(const char *begin, const char *end,
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int newblock); /* Parser for html-comments */
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static int dogtlt(const char *begin, const char *end,
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int newblock); /* Parser for < and > */
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static int dohtml(const char *begin, const char *end,
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int newblock); /* Parser for html */
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static int dolineprefix(const char *begin, const char *end,
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int newblock); /* Parser for line prefix tags */
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static int dolink(const char *begin, const char *end,
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int newblock); /* Parser for links and images */
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static int dolist(const char *begin, const char *end,
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int newblock); /* Parser for lists */
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static int doparagraph(const char *begin, const char *end,
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int newblock); /* Parser for paragraphs */
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static int doreplace(const char *begin, const char *end,
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int newblock); /* Parser for simple replaces */
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static int doshortlink(const char *begin, const char *end,
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int newblock); /* Parser for links and images */
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static int dosurround(const char *begin, const char *end,
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int newblock); /* Parser for surrounding tags */
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static int dounderline(const char *begin, const char *end,
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int newblock); /* Parser for underline tags */
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off64_t get_file_size(const char *);
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char *read_file(const char *, off64_t);
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static int doamp(const char *begin, const char *end, int newblock);
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static int docomment(const char *begin, const char *end, int newblock);
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static int dogtlt(const char *begin, const char *end, int newblock);
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static int dohtml(const char *begin, const char *end, int newblock);
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static int dolineprefix(const char *begin, const char *end, int newblock);
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static int dolink(const char *begin, const char *end, int newblock);
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static int dolist(const char *begin, const char *end, int newblock);
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static int doparagraph(const char *begin, const char *end, int newblock);
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static int doreplace(const char *begin, const char *end, int newblock);
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static int doshortlink(const char *begin, const char *end, int newblock);
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static int dosurround(const char *begin, const char *end, int newblock);
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static int dounderline(const char *begin, const char *end, int newblock);
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static void *ereallocz(void *p, size_t size);
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static void eprint(const char *format, ...);
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static void hprint(const char *begin,
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const char *end); /* escapes HTML and prints it to output */
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static void process(const char *begin, const char *end,
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int isblock); /* Processes range between begin and end. */
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static void hprint(const char *begin, const char *end);
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static void process(const char *begin, const char *end, int isblock);
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/* list of parsers */
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static Parser parsers[] = { dounderline, docomment, dolineprefix, dolist,
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@ -62,7 +63,7 @@ static Parser parsers[] = { dounderline, docomment, dolineprefix, dolist,
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doshortlink, dohtml, doamp, doreplace };
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static int nohtml = 0;
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static Tag lineprefix[] = {
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static struct tag lineprefix[] = {
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{ " ", 0, "<pre><code>", "\n</code></pre>" },
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{ "\t", 0, "<pre><code>", "\n</code></pre>" },
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{ ">", 2, "<blockquote>", "</blockquote>" },
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@ -75,12 +76,13 @@ static Tag lineprefix[] = {
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{ "- - -\n", 1, "<hr />", "" },
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};
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static Tag underline[] = {
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static struct tag underline[] = {
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{ "=", 1, "<h1>", "</h1>\n" },
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{ "-", 1, "<h2>", "</h2>\n" },
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};
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static Tag surround[] = {
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static struct tag surround[] = {
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{ "```", 0, "<code>", "</code>" },
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{ "``", 0, "<code>", "</code>" },
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{ "`", 0, "<code>", "</code>" },
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{ "___", 1, "<strong><em>", "</em></strong>" },
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@ -102,6 +104,42 @@ static const char *insert[][2] = {
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{ " \n", "<br />" },
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};
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off64_t get_file_size(const char *path)
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{
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struct stat st;
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if (stat(path, &st) == 0)
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return st.st_size;
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return -1;
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}
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char *read_file(const char *path, off64_t file_size)
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{
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int fd = open(path, O_LARGEFILE | O_NONBLOCK);
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ssize_t bytes;
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char *buf = calloc(file_size + 4, sizeof(char));
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if (!buf) {
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perror("");
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close(fd);
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return NULL;
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}
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bytes = read(fd, buf, file_size);
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if (bytes != file_size) {
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perror("");
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close(fd);
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free(buf);
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return NULL;
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}
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close(fd);
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return buf;
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}
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void eprint(const char *format, ...)
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{
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va_list ap;
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@ -109,7 +147,6 @@ void eprint(const char *format, ...)
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va_start(ap, format);
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vfprintf(stderr, format, ap);
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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int doamp(const char *begin, const char *end, int newblock)
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@ -238,7 +275,7 @@ int dolineprefix(const char *begin, const char *end, int newblock)
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}
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while (p < end) {
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ADDC(buffer, j) = *p;
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ADDC(buffer, j, *p);
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j++;
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if (*(p++) == '\n')
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break;
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@ -250,7 +287,7 @@ int dolineprefix(const char *begin, const char *end, int newblock)
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j--;
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}
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ADDC(buffer, j) = '\0';
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ADDC(buffer, j, '\0');
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if (lineprefix[i].process)
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process(buffer, buffer + strlen(buffer),
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lineprefix[i].process >= 2);
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@ -399,7 +436,7 @@ int dolist(const char *begin, const char *end, int newblock)
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q++)
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;
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if (*q == '\n') {
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ADDC(buffer, i) = '\n';
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ADDC(buffer, i, '\0');
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i++;
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run = 0;
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isblock++;
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@ -428,7 +465,7 @@ int dolist(const char *begin, const char *end, int newblock)
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j++)
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;
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if (j == indent) {
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ADDC(buffer, i) = '\n';
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ADDC(buffer, i, '\n');
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i++;
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p += indent;
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run = 1;
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@ -439,9 +476,9 @@ int dolist(const char *begin, const char *end, int newblock)
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} else if (j < indent)
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run = 0;
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}
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ADDC(buffer, i) = *p;
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ADDC(buffer, i, *p);
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}
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ADDC(buffer, i) = '\0';
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ADDC(buffer, i, '\0');
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fputs("<li>", stdout);
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process(buffer, buffer + i,
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isblock > 1 || (isblock == 1 && run));
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@ -640,7 +677,8 @@ void hprint(const char *begin, const char *end)
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void process(const char *begin, const char *end, int newblock)
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{
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const char *p, *q;
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const char *q;
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const char *p;
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int affected;
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unsigned int i;
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@ -674,9 +712,8 @@ void process(const char *begin, const char *end, int newblock)
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int main(int argc, char *argv[])
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{
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char *buffer = NULL;
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int s, i;
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unsigned long len, bsize;
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FILE *source = stdin;
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const char *path = "STDIN";
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int i;
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for (i = 1; i < argc; i++) {
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if (!strcmp("-v", argv[i]))
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@ -692,22 +729,20 @@ int main(int argc, char *argv[])
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eprint("Usage %s [-n] [file]\n -n escape html strictly\n",
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argv[0]);
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}
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if (i < argc && !(source = fopen(argv[i], "r")))
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eprint("Cannot open file `%s`\n", argv[i]);
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bsize = 2 * BUFSIZ;
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buffer = ereallocz(buffer, bsize);
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len = 0;
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while ((s = fread(buffer + len, 1, BUFSIZ, source))) {
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len += s;
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if (BUFSIZ + len + 1 > bsize) {
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bsize += BUFSIZ;
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if (!(buffer = realloc(buffer, bsize)))
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eprint("realloc failed.");
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}
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if (i < argc)
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path = argv[i];
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off64_t len = get_file_size(path);
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if (len == -1) {
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eprint("%s: %s: %s\n", argv[0], path, strerror(errno));
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return EXIT_FAILURE;
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}
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buffer = read_file(path, len);
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if (!buffer)
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return EXIT_FAILURE;
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buffer[len] = '\0';
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process(buffer, buffer + len, 1);
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fclose(source);
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free(buffer);
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return EXIT_SUCCESS;
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}
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