| -rw-r--r-- | html.c | 36 |
1 files changed, 32 insertions, 4 deletions
@@ -1,63 +1,89 @@ /* html.c: helper functions for html output * * Copyright (C) 2006 Lars Hjemli * * Licensed under GNU General Public License v2 * (see COPYING for full license text) */ #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <string.h> #include <errno.h> +/* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */ +static const char* url_escape_table[256] = { + "%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07", "%08", "%09", + "%0a", "%0b", "%0c", "%0d", "%0e", "%0f", "%10", "%11", "%12", "%13", + "%14", "%15", "%16", "%17", "%18", "%19", "%1a", "%1b", "%1c", "%1d", + "%1e", "%1f", "%20", 0, "%22", "%23", 0, "%25", "%26", "%27", 0, 0, 0, + "%2b", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%3c", "%3d", + "%3e", "%3f", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, "%5c", 0, "%5e", 0, "%60", 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%7b", + "%7c", "%7d", 0, "%7f", "%80", "%81", "%82", "%83", "%84", "%85", + "%86", "%87", "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f", + "%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97", "%98", "%99", + "%9a", "%9b", "%9c", "%9d", "%9e", "%9f", "%a0", "%a1", "%a2", "%a3", + "%a4", "%a5", "%a6", "%a7", "%a8", "%a9", "%aa", "%ab", "%ac", "%ad", + "%ae", "%af", "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7", + "%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf", "%c0", "%c1", + "%c2", "%c3", "%c4", "%c5", "%c6", "%c7", "%c8", "%c9", "%ca", "%cb", + "%cc", "%cd", "%ce", "%cf", "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", + "%d6", "%d7", "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df", + "%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7", "%e8", "%e9", + "%ea", "%eb", "%ec", "%ed", "%ee", "%ef", "%f0", "%f1", "%f2", "%f3", + "%f4", "%f5", "%f6", "%f7", "%f8", "%f9", "%fa", "%fb", "%fc", "%fd", + "%fe", "%ff" +}; + int htmlfd = STDOUT_FILENO; char *fmt(const char *format, ...) { static char buf[8][1024]; static int bufidx; int len; va_list args; bufidx++; bufidx &= 7; va_start(args, format); len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args); va_end(args); if (len>sizeof(buf[bufidx])) { fprintf(stderr, "[html.c] string truncated: %s\n", format); exit(1); } return buf[bufidx]; } void html_raw(const char *data, size_t size) { write(htmlfd, data, size); } void html(const char *txt) { write(htmlfd, txt, strlen(txt)); } void htmlf(const char *format, ...) { static char buf[65536]; va_list args; va_start(args, format); vsnprintf(buf, sizeof(buf), format, args); va_end(args); html(buf); } void html_status(int code, const char *msg, int more_headers) { htmlf("Status: %d %s\n", code, msg); if (!more_headers) html("\n"); @@ -90,115 +116,117 @@ void html_ntxt(int len, const char *txt) while(t && *t && len--){ int c = *t; if (c=='<' || c=='>' || c=='&') { write(htmlfd, txt, t - txt); if (c=='>') html(">"); else if (c=='<') html("<"); else if (c=='&') html("&"); txt = t+1; } t++; } if (t!=txt) write(htmlfd, txt, t - txt); if (len<0) html("..."); } void html_attr(const char *txt) { const char *t = txt; while(t && *t){ int c = *t; if (c=='<' || c=='>' || c=='\'' || c=='\"') { write(htmlfd, txt, t - txt); if (c=='>') html(">"); else if (c=='<') html("<"); else if (c=='\'') html("'"); else if (c=='"') html("""); txt = t+1; } t++; } if (t!=txt) html(txt); } void html_url_path(const char *txt) { const char *t = txt; while(t && *t){ int c = *t; - if (c=='"' || c=='#' || c=='\'' || c=='?') { + const char *e = url_escape_table[c]; + if (e && c!='+' && c!='&' && c!='+') { write(htmlfd, txt, t - txt); - write(htmlfd, fmt("%%%2x", c), 3); + write(htmlfd, e, 3); txt = t+1; } t++; } if (t!=txt) html(txt); } void html_url_arg(const char *txt) { const char *t = txt; while(t && *t){ int c = *t; - if (c=='"' || c=='#' || c=='%' || c=='&' || c=='\'' || c=='+' || c=='?') { + const char *e = url_escape_table[c]; + if (e) { write(htmlfd, txt, t - txt); - write(htmlfd, fmt("%%%2x", c), 3); + write(htmlfd, e, 3); txt = t+1; } t++; } if (t!=txt) html(txt); } void html_hidden(const char *name, const char *value) { html("<input type='hidden' name='"); html_attr(name); html("' value='"); html_attr(value); html("'/>"); } void html_option(const char *value, const char *text, const char *selected_value) { html("<option value='"); html_attr(value); html("'"); if (selected_value && !strcmp(selected_value, value)) html(" selected='selected'"); html(">"); html_txt(text); html("</option>\n"); } void html_link_open(const char *url, const char *title, const char *class) { html("<a href='"); html_attr(url); if (title) { html("' title='"); html_attr(title); } if (class) { html("' class='"); html_attr(class); } html("'>"); } void html_link_close(void) { html("</a>"); } |