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C: add portable_basename.*
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258
c-programming/strings/portable_basename.c
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258
c-programming/strings/portable_basename.c
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/*
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* portable_basename.c
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*
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* Author: Intel A80486DX2-66
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* License: Unlicense
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*/
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#include "portable_basename.h"
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static char* correct_slashes(const char* path) {
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char* new_path = strdup(path);
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if (new_path == NULL)
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return NULL;
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char* ptr = new_path;
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while (*ptr != '\0') {
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if (*ptr == '\\')
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*ptr = '/';
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ptr++;
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}
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return new_path;
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}
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char* portable_basename(const char* raw_path) {
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char* path = correct_slashes(raw_path);
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if (path == NULL)
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return NULL;
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char* base = malloc(FILENAME_MAX * sizeof(char));
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if (base == NULL) {
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free(path);
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return NULL;
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}
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size_t fname_len = strlen(path);
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const char* last_slash = strrchr(path, '/');
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if (last_slash != NULL)
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fname_len = strlen(last_slash + 1);
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memcpy(base, last_slash + 1, fname_len);
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base[fname_len] = '\0';
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return base;
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}
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#ifdef TEST
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# include <inttypes.h>
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# include <stdbool.h>
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# include <stdio.h>
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# include <time.h>
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// system identification
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# ifdef _WIN32
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# define SYS_NT
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# include <windows.h>
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# endif
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# if defined(__unix__) || defined(__APPLE__)
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# define SYS_UNIX
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# endif
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// macros
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# if defined(SYS_UNIX) && !defined(CLOCK_MONOTONIC_RAW)
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# define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
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# endif
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// function prototypes
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long double clock_hr_microsec(void);
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# ifdef SYS_NT
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void WinAPI_perror(const char* s);
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# endif
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static void func_expect(const char* path, const char* expected_output,
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bool expect_to_succeed);
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long double clock_hr_microsec(void) {
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# ifdef SYS_NT
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// TODO: FIXME: less accurate than Unix
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LARGE_INTEGER counter;
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if (!QueryPerformanceCounter(&counter)) {
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WinAPI_perror("QueryPerformanceCounter");
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exit(EXIT_FAILURE);
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}
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return (long double) (counter.QuadPart * 1000000ULL);
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# elif SYS_UNIX
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
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return ((long double) (ts.tv_sec * 1000000000ULL + ts.tv_nsec)) / 1000.l;
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# else
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return (long double) (clock() * 1000000ULL);
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# endif
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}
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// macros
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# ifdef SYS_NT
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# define WinAPI_perror_COMMON_MACRO \
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fprintf(stderr, "%s: %lu, %s", s, errorCode, errorString)
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// function implementations
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void WinAPI_perror(const char* s) {
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DWORD errorCode = GetLastError();
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LPSTR errorString = NULL;
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FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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errorCode,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPSTR)&errorString,
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0,
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NULL
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);
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if (errorString == NULL) {
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errorString = "???\n";
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WinAPI_perror_COMMON_MACRO;
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} else {
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WinAPI_perror_COMMON_MACRO;
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LocalFree(errorString);
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}
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}
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# endif
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// macros
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# if defined(SYS_NT)
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LONGLONG QPF_frequency;
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# define CLOCK_HR_DIFFTIME_MS(t2, t1) \
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((long double) ((t2) - (t1))) / ((long double) QPF_frequency)
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# elif defined(SYS_UNIX)
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# define CLOCK_HR_DIFFTIME_MS(t2, t1) \
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((t2) - (t1))
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# else
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# define CLOCK_HR_DIFFTIME_MS(t2, t1) \
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((long double) ((t2) - (t1)) * 1000000.L) / \
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((long double) CLOCKS_PER_SEC)
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# endif
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// global variables
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uintmax_t tests_failed = 0;
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// function implementations
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static void func_expect(const char* path, const char* expected_output,
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bool expect_to_succeed) {
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long double t1 = 0, t2 = 0;
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t1 = clock_hr_microsec();
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char* output = portable_basename(path);
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t2 = clock_hr_microsec();
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if (output == NULL) {
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perror("portable_basename");
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exit(EXIT_FAILURE);
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}
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const char* caption = expect_to_succeed ? "Expected output "
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: "Unexpected output";
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long double t = CLOCK_HR_DIFFTIME_MS(t2, t1);
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printf("Input path : '%s'\n"
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"%s: '%s'\n"
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"Actual output : '%s'\n"
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"Time, clock_t : %.3Lf microsec\n"
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"Test result : ", path, caption, expected_output, output, t);
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if ((bool) (strcmp(output, expected_output)) == expect_to_succeed) {
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tests_failed++;
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free(output);
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puts("Failed!\n");
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return;
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}
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puts("Passed\n");
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free(output);
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fflush(stdout);
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}
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// macros
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#define STRINGIZE(x) #x
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#define INT2STR(x) STRINGIZE(x)
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#define TIMES_TO_CALL 65535
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#include<unistd.h>
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int main(void) {
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# ifdef SYS_NT
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// set console output code page to the native one
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SetConsoleOutputCP(GetACP());
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// get CPU frequency
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LARGE_INTEGER freq;
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if (!QueryPerformanceFrequency(&freq)) {
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WinAPI_perror("QueryPerformanceFrequency");
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return EXIT_FAILURE;
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}
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QPF_frequency = freq.QuadPart;
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# endif
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// positive tests
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func_expect("/", "", true);
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func_expect("/usr/include/stdlib.h", "stdlib.h", true);
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func_expect("C:\\Windows\\Fonts\\consola.ttf", "consola.ttf", true);
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func_expect("\\..\\..\\directory\\.e.x.e.c.u.t.a.b.l.e.",
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".e.x.e.c.u.t.a.b.l.e.", true);
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// negative tests
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func_expect("/a/.b.c.", "b.c", false);
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func_expect("/a/.b.c.", ".b.c", false);
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func_expect("/a/.b.c.", "b.c.", false);
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func_expect("/a/.b.c.\\", ".b.c.", false);
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printf("Failed tests: %" PRIuMAX "\n", tests_failed);
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// timing test
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puts("\nBenchmarking (" INT2STR(TIMES_TO_CALL) " calls):");
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fflush(stdout);
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#define BENCHMARKING_STRING_SET \
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"a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r\\s\\t\\u\\v\\w\\x\\y\\z\\.\\file", \
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"/mnt/cdrom/usr/bin/include/library/test_files/test.h"
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const char* string_set[] = {
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BENCHMARKING_STRING_SET,
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// HACK: try to prevent caching by using different pointers
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BENCHMARKING_STRING_SET,
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BENCHMARKING_STRING_SET,
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BENCHMARKING_STRING_SET
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};
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const size_t string_set_len = sizeof(string_set) / sizeof(char*);
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long double t_beginning = 0, t_end = 0;
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long double t_total = 0.l;
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for (uint_fast16_t i = 0; i < TIMES_TO_CALL; i++) {
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const char* selected_string = string_set[i % string_set_len];
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t_beginning = clock_hr_microsec();
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char* output = portable_basename(selected_string);
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t_end = clock_hr_microsec();
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if (output == NULL) {
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perror("portable_basename");
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return EXIT_FAILURE;
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}
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free(output);
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t_total += CLOCK_HR_DIFFTIME_MS(t_end, t_beginning);
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}
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printf("Total time: %.3Lf microsec, avg. %.3Lf microsec\n", t_total,
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t_total / ((long double) TIMES_TO_CALL));
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return (tests_failed > 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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#endif /* TEST */
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18
c-programming/strings/portable_basename.h
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18
c-programming/strings/portable_basename.h
Normal file
@ -0,0 +1,18 @@
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/*
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* portable_basename.h
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*
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* Author: Intel A80486DX2-66
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* License: Unlicense
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*/
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#ifndef _PORTABLE_BASENAME_H
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#define _PORTABLE_BASENAME_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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static char* correct_slashes(const char* path);
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char* portable_basename(const char* raw_path);
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#endif /* _PORTABLE_BASENAME_H */
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