/* html.c: helper functions for html output * * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com> * * Licensed under GNU General Public License v2 * (see COPYING for full license text) */ #include "cgit.h" #include "html.h" #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" }; 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]; } char *fmtalloc(const char *format, ...) { struct strbuf sb = STRBUF_INIT; va_list args; va_start(args, format); strbuf_vaddf(&sb, format, args); va_end(args); return strbuf_detach(&sb, NULL); } void html_raw(const char *data, size_t size) { if (write(STDOUT_FILENO, data, size) != size) die_errno("write error on html output"); } void html(const char *txt) { html_raw(txt, strlen(txt)); } void htmlf(const char *format, ...) { va_list args; struct strbuf buf = STRBUF_INIT; va_start(args, format); strbuf_vaddf(&buf, format, args); va_end(args); html(buf.buf); strbuf_release(&buf); } void html_txtf(const char *format, ...) { va_list args; va_start(args, format); html_vtxtf(format, args); va_end(args); } void html_vtxtf(const char *format, va_list ap) { va_list cp; struct strbuf buf = STRBUF_INIT; va_copy(cp, ap); strbuf_vaddf(&buf, format, cp); va_end(cp); html_txt(buf.buf); strbuf_release(&buf); } void html_status(int code, const char *msg, int more_headers) { htmlf("Status: %d %s\n", code, msg); if (!more_headers) html("\n"); } void html_txt(const char *txt) { const char *t = txt; while (t && *t) { int c = *t; if (c == '<' || c == '>' || c == '&') { html_raw(txt, t - txt); if (c == '>') html(">"); else if (c == '<') html("<"); else if (c == '&') html("&"); txt = t + 1; } t++; } if (t != txt) html(txt); } void html_ntxt(int len, const char *txt) { const char *t = txt; while (t && *t && len--) { int c = *t; if (c == '<' || c == '>' || c == '&') { html_raw(txt, t - txt); if (c == '>') html(">"); else if (c == '<') html("<"); else if (c == '&') html("&"); txt = t + 1; } t++; } if (t != txt) html_raw(txt, t - txt); if (len < 0) html("..."); } void html_attrf(const char *fmt, ...) { va_list ap; struct strbuf sb = STRBUF_INIT; va_start(ap, fmt); strbuf_vaddf(&sb, fmt, ap); va_end(ap); html_attr(sb.buf); strbuf_release(&sb); } void html_attr(const char *txt) { const char *t = txt; while (t && *t) { int c = *t; if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') { html_raw(txt, t - txt); if (c == '>') html(">"); else 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) { unsigned char c = *t; const char *e = url_escape_table[c]; if (e && c != '+' && c != '&') { html_raw(txt, t - txt); html(e); txt = t + 1; } t++; } if (t != txt) html(txt); } void html_url_arg(const char *txt) { const char *t = txt; while (t && *t) { unsigned char c = *t; const char *e = url_escape_table[c]; if (c == ' ') e = "+"; if (e) { html_raw(txt, t - txt); html(e); 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_intoption(int value, const char *text, int selected_value) { htmlf("<option value='%d'%s>", value, value == selected_value ? " selected='selected'" : ""); html_txt(text); html("</option>"); } 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>"); } void html_fileperm(unsigned short mode) { htmlf("%c%c%c", (mode & 4 ? 'r' : '-'), (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-')); } int html_include(const char *filename) { FILE *f; char buf[4096]; size_t len; if (!(f = fopen(filename, "r"))) { fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n", filename, strerror(errno), errno); return -1; } while ((len = fread(buf, 1, 4096, f)) > 0) html_raw(buf, len); fclose(f); return 0; } static int hextoint(char c) { if (c >= 'a' && c <= 'f') return 10 + c - 'a'; else if (c >= 'A' && c <= 'F') return 10 + c - 'A'; else if (c >= '0' && c <= '9') return c - '0'; else return -1; } static char *convert_query_hexchar(char *txt) { int d1, d2, n; n = strlen(txt); if (n < 3) { *txt = '\0'; return txt-1; } d1 = hextoint(*(txt + 1)); d2 = hextoint(*(txt + 2)); if (d1 < 0 || d2 < 0) { memmove(txt, txt + 3, n - 2); return txt-1; } else { *txt = d1 * 16 + d2; memmove(txt + 1, txt + 3, n - 2); return txt; } } int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value)) { char *o, *t, *txt, *value = NULL, c; if (!txt_) return 0; o = t = txt = xstrdup(txt_); while ((c=*t) != '\0') { if (c == '=') { *t = '\0'; value = t + 1; } else if (c == '+') { *t = ' '; } else if (c == '%') { t = convert_query_hexchar(t); } else if (c == '&') { *t = '\0'; (*fn)(txt, value); txt = t + 1; value = NULL; } t++; } if (t != txt) (*fn)(txt, value); free(o); return 0; }