languageserver/src/reader.c at 2916e24505f61836a492e39f0975a8dce13800bb · REditorSupport/languageserver · GitHub

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#include "reader.h"


#if defined(_WIN32) || defined(_WIN64)

#include <string.h>
#include <windows.h>

char* buf = NULL;
int bufsize = 1024;
int bufpos = 0;

SEXP stdin_read_char(SEXP _n) {
    int n = Rf_asInteger(_n);
    HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
    DWORD bytes_avail, bytes_read;

    if (buf == NULL) {
        buf = (char*) malloc((bufsize + 1) * sizeof(char));
    }
    while (bufsize < n) {
        bufsize = 2 * n;
        buf = (char*) realloc(buf, (bufsize + 1) * sizeof(char));
    }

    if (PeekNamedPipe(h, NULL, 0, NULL, &bytes_avail, NULL)) {
        if (bytes_avail > 0) {
            ReadFile(h, buf, n, &bytes_read, NULL);
            buf[bytes_read] = '\0';
            return Rf_ScalarString(Rf_mkCharCE(buf, CE_UTF8));
        }
        return Rf_allocVector(STRSXP, 0);
    } else {
        Rf_error("stdin connection close");
    }
}


SEXP stdin_read_line(void) {
    HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
    DWORD bytes_avail, bytes_read;
    char c;

    if (buf == NULL) {
        buf = (char*) malloc((bufsize + 1) * sizeof(char));
    }

    if (PeekNamedPipe(h, NULL, 0, NULL, &bytes_avail, NULL)) {
        if (bytes_avail > 0) {
            while (bytes_avail > bufpos) {
                ReadFile(h, &c, 1, &bytes_read, NULL);
                if (bytes_read == 1) {
                    buf[bufpos] = c;
                    if (c == '\n') {
                        buf[bufpos] = '\0';
                        if (bufpos > 0 && buf[bufpos - 1] == '\r') {
                            buf[bufpos - 1] = '\0';
                        }
                        bufpos = 0;
                        return Rf_ScalarString(Rf_mkCharCE(buf, CE_UTF8));
                    }
                    bufpos++;
                    if (bufpos >= bufsize) {
                        bufsize = bufsize * 2;
                        buf = realloc(buf, (bufsize + 1) * sizeof(char));
                    }
                } else {
                    Rf_error("unexpected error");
                }
            }
        }
        return Rf_allocVector(STRSXP, 0);
    } else {
        Rf_error("stdin connection close");
    }
}

#else

#include <unistd.h>
#include <fcntl.h>

char* buf = NULL;
int bufsize = 1024;
int bufpos = 0;

SEXP stdin_read_char(SEXP _n) {
    int n = Rf_asInteger(_n);
    int bytes_read = 0;

    if (buf == NULL) {
        buf = (char*) malloc((bufsize + 1) * sizeof(char));
    }

    while (bufsize < n) {
        bufsize = 2 * n;
        buf = (char*) realloc(buf, (bufsize + 1) * sizeof(char));
    }

    bytes_read = read(0, buf, n);

    if (bytes_read > 0) {
        buf[bytes_read] = '\0';
        return Rf_ScalarString(Rf_mkCharCE(buf, CE_UTF8));
    } else {
        return Rf_allocVector(STRSXP, 0);
    }
}

SEXP stdin_read_line(void) {
    char c;

    if (buf == NULL) {
        buf = (char*) malloc((bufsize + 1) * sizeof(char));
    }

    while (read(0, &c, 1) == 1) {
        buf[bufpos] = c;
        if (c == '\n') {
            buf[bufpos] = '\0';
            if (bufpos > 0 && buf[bufpos - 1] == '\r') {
                buf[bufpos - 1] = '\0';
            }
            bufpos = 0;
            return Rf_ScalarString(Rf_mkCharCE(buf, CE_UTF8));
        }
        bufpos++;
        if (bufpos >= bufsize) {
            bufsize = bufsize * 2;
            buf = realloc(buf, (bufsize + 1) * sizeof(char));
        }
    }

    return Rf_allocVector(STRSXP, 0);
}

#endif