--- /dev/null
+// SPDX-FileCopyrightText: 2025 Lady <https://www.ladys.computer/about/#lady>
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "aa.h"
+#include "request.h"
+
+void cgirls_freereq (cgirls_req req) {
+ free(req.cgirls_project);
+ free(req.cgirls_id);
+ if (req.cgirls_subpath) {
+ size_t i = 0;
+ char* c = req.cgirls_subpath[i];
+ while (c) {
+ free(c);
+ c = req.cgirls_subpath[++i];
+ }
+ free(req.cgirls_subpath);
+ }
+ free(req.cgirls_baseid);
+ free(req.cgirls_status.cgirls_message);
+}
+
+cgirls_req cgirls_path2req(char const*const pathinfo) {
+ assert(pathinfo != nullptr);
+
+ // Initialize the result.
+ cgirls_req req = {
+ .cgirls_action = cgirls_vb_index,
+ .cgirls_type = cgirls_mediatype_any,
+ .cgirls_project = nullptr,
+ .cgirls_id = nullptr,
+ .cgirls_subpath = nullptr,
+ .cgirls_baseid = nullptr,
+ .cgirls_status = {
+ .cgirls_code = 200,
+ .cgirls_message = nullptr,
+ },
+ };
+
+ // `sont´ stores the start of the next term; `eopi´ stores the end of
+ // the `pathinfo´ string, excluding any extension.
+ char const* sont = pathinfo;
+ char const*const eopi = strchr(pathinfo, 0);
+
+ // The portion of the pathinfo which precedes the first slash gives
+ // the project of the request. If there is no first slash, the
+ // project extends to the end of the string. An empty string is
+ // equivalent to having no project.
+ char const* eopj = strchr(sont, '/');
+ if (!eopj) {
+ eopj = eopi;
+ }
+ if (eopj > sont) {
+ req.cgirls_project = strndup(sont, eopj - sont);
+ }
+ if (eopj < eopi) {
+ sont = eopj + 1;
+ } else {
+ sont = eopi;
+ }
+
+ // The portion of the pathinfo which follows the first slash but
+ // precedes the second gives the verb of the request. If there is no
+ // second slash, the verb extends to the end of the string. If the
+ // verb is not present, or is the empty string, it is treated as
+ // `"index"´, unless the second slash is present, in which case it is
+ // treated as `"unknown"´.
+ //
+ // Verbs may be suffixed with one of a small number of extensions to
+ // request a specific type of response.
+ //
+ // Only a few verbs are recognized (corresponding to the `cgirls_vb´
+ // constants). If a verb is present, but unrecognized, it is assigned
+ // the special value `cgirls_vb_unknown´, which should generally be
+ // interpreted as an error.
+ char const* eovb = strchr(sont, '/');
+ if (!eovb) {
+ eovb = eopi;
+ }
+ char const*const eove = eovb;
+ char* verb = nullptr;
+ if (eovb - sont > 4) {
+ // If the verb is at least 5 characters, extract the extension if
+ // present (it will be the last 4), and then set the end of the
+ // verb to the start of the extension.
+ char const* exts = eovb - 4;
+ do {
+ // This “loop” encapsulates extension checking for readability.
+ // If an extension matches, `eovb´ is re·assigned to point to the
+ // beginning of the extension. Otherwise, the loop exits early
+ // and `eovb´ keeps pointing at the end of the string.
+ if (strncmp(exts, ".txt", 4) == 0) {
+ req.cgirls_type = cgirls_mediatype_txt;
+ } else if (strncmp(exts, ".htm", 4) == 0) {
+ req.cgirls_type = cgirls_mediatype_htm;
+ } else if (strncmp(exts, ".xml", 4) == 0) {
+ req.cgirls_type = cgirls_mediatype_xml;
+ } else if (strncmp(exts, ".rdf", 4) == 0) {
+ req.cgirls_type = cgirls_mediatype_rdf;
+ } else {
+ break; // do not re·assign `eovb´
+ }
+ eovb = exts;
+ } while (false);
+ }
+ if (eovb > sont) {
+ verb = strndup(sont, eovb - sont);
+ }
+ if (eove < eopi) {
+ sont = eove + 1;
+ } else {
+ sont = eopi;
+ }
+ if (verb) {
+ if (strcmp(verb, "branches") == 0) {
+ req.cgirls_action = cgirls_vb_branches;
+ } else if (strcmp(verb, "tags") == 0) {
+ req.cgirls_action = cgirls_vb_tags;
+ } else if (strcmp(verb, "show") == 0) {
+ req.cgirls_action = cgirls_vb_show;
+ } else if (strcmp(verb, "raw") == 0) {
+ req.cgirls_action = cgirls_vb_raw;
+ } else if (strcmp(verb, "blame") == 0) {
+ req.cgirls_action = cgirls_vb_blame;
+ } else if (strcmp(verb, "log") == 0) {
+ req.cgirls_action = cgirls_vb_log;
+ } else if (strcmp(verb, "shortlog") == 0) {
+ req.cgirls_action = cgirls_vb_shortlog;
+ } else if (strcmp(verb, "atom") == 0) {
+ req.cgirls_action = cgirls_vb_atom;
+ } else if (strcmp(verb, "patch") == 0) {
+ req.cgirls_action = cgirls_vb_patch;
+ } else if (strcmp(verb, "index") != 0) {
+ req.cgirls_action = cgirls_vb_unknown;
+ }
+ free(verb);
+ } else if (eovb < eopi) {
+ req.cgirls_action = cgirls_vb_unknown;
+ }
+
+ // The portion of the pathinfo which follows the second slash but
+ // precedes the third identifies the identifiers for the request. If
+ // there is no third slash, the identifiers extend to the end of the
+ // string. A single identifier may be given, or two identifiers may
+ // be given separated by two periods. An empty string is equivalent
+ // to no identifier.
+ char const* eoid = strchr(sont, '/');
+ if (!eoid) {
+ eoid = eopi;
+ }
+ char* idid = nullptr;
+ if (eoid > sont) {
+ idid = strndup(sont, eoid - sont);
+ }
+ if (eoid < eopi) {
+ sont = eoid + 1;
+ } else {
+ sont = eopi;
+ }
+ if (idid) {
+ // If the identifier string contains two successive dots, the base
+ // and target identifiers must be extracted and the original
+ // identifier string freed. Otherwise, the identifier string is the
+ // target identifier, and there is no base.
+ char const*const dots = strstr(idid, "..");
+ if (dots) {
+ char const*const eods = dots + 2;
+ char const*const eoii = strchr(idid, 0);
+ if (dots > idid) {
+ req.cgirls_baseid = strndup(idid, dots - idid);
+ }
+ if (eods < eoii) {
+ req.cgirls_id = strndup(eods, eoii - eods);
+ }
+ free(idid);
+ } else {
+ req.cgirls_id = idid;
+ }
+ }
+
+ // The portion of the pathinfo which follows the third slash is the
+ // subpath of the request. An empty sting is equivalent to having no
+ // subpath. Trailing and successive slashes are dropped.
+ char const* soct = sont;
+ char const* psep = nullptr;
+ size_t npth = 0;
+ while (eopi > soct) {
+ // Count the number of segments in the pathinfo so that the correct
+ // amount of space can be allocated.
+ psep = strchr(soct, '/');
+ if (!psep) {
+ psep = eopi;
+ }
+ if (psep > soct) {
+ ++npth;
+ }
+ if (eopi > psep) {
+ soct = psep + 1;
+ } else {
+ soct = eopi;
+ }
+ }
+ req.cgirls_subpath = calloc(npth + 1, sizeof(char*));
+ if (!req.cgirls_subpath) {
+ return req;
+ }
+ size_t pthi = 0;
+ while (eopi > sont) {
+ // Add the segments to the newly allocated array.
+ psep = strchr(sont, '/');
+ if (!psep) {
+ psep = eopi;
+ }
+ if (psep > sont) {
+ req.cgirls_subpath[pthi++] = strndup(sont, psep - sont);
+ }
+ if (eopi > psep) {
+ sont = psep + 1;
+ } else {
+ sont = eopi;
+ }
+ }
+ assert(pthi == npth);
+ req.cgirls_subpath[pthi] = nullptr;
+
+ // Return the result.
+ return req;
+}
+
+char* cgirls_req2path(cgirls_req req) {
+ char* action = "unknown";
+ char* extnsn = "";
+ size_t length = 8; // length of `action´ plus 1, to start
+
+ // Get the length of the various parts, saving the verb and the
+ // extension. This length includes a trailing slash, but in practice
+ // this will be replaced by the final null byte.
+ switch (req.cgirls_action) {
+ case cgirls_vb_index:
+ action = "index";
+ length = 6;
+ break;
+ case cgirls_vb_branches:
+ action = "branches";
+ length = 9;
+ break;
+ case cgirls_vb_tags:
+ action = "tags";
+ length = 5;
+ break;
+ case cgirls_vb_show:
+ action = "show";
+ length = 5;
+ break;
+ case cgirls_vb_raw:
+ action = "raw";
+ length = 4;
+ break;
+ case cgirls_vb_blame:
+ action = "blame";
+ length = 6;
+ break;
+ case cgirls_vb_log:
+ action = "log";
+ length = 4;
+ break;
+ case cgirls_vb_shortlog:
+ action = "shortlog";
+ length = 9;
+ break;
+ case cgirls_vb_atom:
+ action = "atom";
+ length = 5;
+ break;
+ case cgirls_vb_patch:
+ action = "patch";
+ length = 6;
+ break;
+ default:
+ break;
+ }
+ switch (req.cgirls_type) {
+ case cgirls_mediatype_txt:
+ extnsn = ".txt";
+ break;
+ case cgirls_mediatype_htm:
+ extnsn = ".htm";
+ break;
+ case cgirls_mediatype_xml:
+ extnsn = ".xml";
+ break;
+ case cgirls_mediatype_rdf:
+ extnsn = ".rdf";
+ break;
+ default:
+ break;
+ }
+ if (req.cgirls_project) {
+ length += strlen(req.cgirls_project) + 1;
+ if (req.cgirls_type != cgirls_mediatype_any) {
+ length += 4;
+ }
+ if (req.cgirls_baseid || req.cgirls_id) {
+ if (req.cgirls_baseid) {
+ length += strlen(req.cgirls_baseid) + 2;
+ }
+ if (req.cgirls_id) {
+ length += strlen(req.cgirls_id);
+ }
+ length += 1;
+ } else if (req.cgirls_subpath && req.cgirls_subpath[0]) {
+ length += 3;
+ }
+ if (req.cgirls_subpath) {
+ size_t i = 0;
+ char* c = req.cgirls_subpath[i];
+ while (c) {
+ length += strlen(c) + 1;
+ c = req.cgirls_subpath[++i];
+ }
+ }
+ } else {
+ // If there is no project, then the action must be removed, and the
+ // length is just that of the trailing slash.
+ length = 1;
+ }
+ // Create and compose the final path.
+ char* result = calloc(length, sizeof(char*));
+ if (!result) {
+ return nullptr;
+ }
+ char* cursor = result;
+ if (req.cgirls_project) {
+ cursor = stpcpy(cursor, req.cgirls_project);
+ (cursor++)[0] = '/';
+ cursor = stpcpy(cursor, action);
+ if (req.cgirls_type != cgirls_mediatype_any) {
+ cursor = stpcpy(cursor, extnsn);
+ }
+ (cursor++)[0] = '/';
+ if (req.cgirls_baseid || req.cgirls_id) {
+ if (req.cgirls_baseid) {
+ cursor = stpcpy(cursor, req.cgirls_baseid);
+ cursor[0] = '.';
+ cursor[1] = '.';
+ cursor += 2;
+ }
+ if (req.cgirls_id) {
+ cursor = stpcpy(cursor, req.cgirls_id);
+ }
+ (cursor++)[0] = '/';
+ } else if (req.cgirls_subpath && req.cgirls_subpath[0]) {
+ cursor = stpcpy(cursor, "../");
+ }
+ if (req.cgirls_subpath) {
+ size_t i = 0;
+ char* c = req.cgirls_subpath[i];
+ while (c) {
+ cursor = stpcpy(cursor, c);
+ c = req.cgirls_subpath[++i];
+ (cursor++)[0] = '/';
+ }
+ }
+ } else {
+ (cursor++)[0] = '/';
+ }
+
+ // At this point, `cursor´ points one ⹐past⹑ the last element of the
+ // array (this is allowed in C), and the last element is a slash.
+ // Rewind and set it to the null byte, and assert that everything was
+ // done correctly.
+ (--cursor)[0] = 0;
+ assert((cursor + 1) - result == length);
+ return result;
+}
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