├── .github └── workflows │ └── main.yml ├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── src └── edu │ └── harvard │ └── CS50.java └── test ├── linux.txt ├── mac.txt └── windows.txt /.github/workflows/main.yml: -------------------------------------------------------------------------------- 1 | on: push 2 | jobs: 3 | build: 4 | runs-on: ubuntu-latest 5 | steps: 6 | - uses: actions/checkout@v4 7 | - name: Install dependencies 8 | run: | 9 | sudo apt-get install -y rpm 10 | sudo gem install fpm package_cloud 11 | 12 | - name: Build 13 | run: | 14 | make deb 15 | make rpm 16 | 17 | - name: Deploy 18 | if: ${{ github.ref == 'refs/heads/main' }} 19 | run: | 20 | PACKAGECLOUD_REPO="cs50/repo" 21 | 22 | # Deploy deb to ubuntu repos 23 | UBUNTU_REPOS=( xenial yakkety zesty artful bionic cosmic disco eoan focal groovy hirsute impish jammy ) 24 | for repo in "${UBUNTU_REPOS[@]}"; do 25 | package_cloud push "$PACKAGECLOUD_REPO"/ubuntu/"$repo" build/deb/*.deb 26 | done 27 | 28 | # Deploy rpm to fedora repos 29 | for repo in $(seq 28 36); do 30 | package_cloud push "$PACKAGECLOUD_REPO"/fedora/"$repo" build/rpm/*.rpm 31 | done 32 | env: 33 | PACKAGECLOUD_TOKEN: ${{ secrets.PACKAGECLOUD_TOKEN }} 34 | 35 | - name: Extract version from Makefile 36 | id: make_version 37 | run: | 38 | echo ::set-output name=version::$(make version) 39 | 40 | - name: Create Release 41 | if: ${{ github.ref == 'refs/heads/main' }} 42 | uses: actions/github-script@v7 43 | with: 44 | github-token: ${{ github.token }} 45 | script: | 46 | github.rest.repos.createRelease({ 47 | owner: context.repo.owner, 48 | repo: context.repo.repo, 49 | tag_name: "v${{ steps.make_version.outputs.version }}", 50 | tag_commitish: "${{ github.sha }}" 51 | }) 52 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .* 2 | !.github 3 | !.gitignore 4 | !.travis.yml 5 | build/ 6 | docs/ 7 | debian/changelog 8 | debian/*.log 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | DESTDIR ?= /usr/local/share/java 2 | VERSION = 3.0.1 3 | 4 | all: build docs deb jar 5 | 6 | .PHONY: build 7 | build: Makefile src/edu/harvard/CS50.java 8 | mkdir -p build/lib 9 | javac -d build/lib src/edu/harvard/CS50.java 10 | cp src/edu/harvard/CS50.java build/lib/edu/harvard 11 | 12 | .PHONY: jar 13 | jar: build 14 | mkdir -p build/jar 15 | jar cvf build/jar/cs50.jar -C build/lib . 16 | 17 | .PHONY: clean 18 | clean: 19 | rm -rf build 20 | 21 | .PHONY: deb 22 | deb: jar 23 | rm -rf build/deb 24 | mkdir -p build/deb/libcs50-java/usr/share/java 25 | cp -r build/jar/* build/deb/libcs50-java/usr/share/java 26 | 27 | fpm \ 28 | --category java \ 29 | --conflicts lib50-java \ 30 | --chdir build/deb/libcs50-java \ 31 | --deb-priority optional \ 32 | --description "CS50 library for Java" \ 33 | --input-type dir \ 34 | --license "MIT" \ 35 | --maintainer "CS50 " \ 36 | --name libcs50-java \ 37 | --output-type deb \ 38 | --package build/deb \ 39 | --provides lib50-java \ 40 | --provides libcs50-java \ 41 | --replaces lib50-java \ 42 | --replaces libcs50-java \ 43 | --url https://github.com/cs50/libcs50-java \ 44 | --vendor CS50 \ 45 | --version $(VERSION) \ 46 | . 47 | 48 | rm -rf build/deb/libcs50-java 49 | 50 | .PHONY: rpm 51 | rpm: jar 52 | rm -rf build/rpm 53 | mkdir -p build/rpm/libcs50-java/usr/share/java 54 | cp -r build/jar/* build/rpm/libcs50-java/usr/share/java 55 | 56 | fpm \ 57 | --category java \ 58 | --conflicts lib50-java \ 59 | --chdir build/rpm/libcs50-java \ 60 | --description "CS50 library for Java" \ 61 | --input-type dir \ 62 | --license "MIT" \ 63 | --maintainer "CS50 " \ 64 | --name libcs50-java \ 65 | --output-type rpm \ 66 | --package build/rpm \ 67 | --provides libcs50-java \ 68 | --url https://github.com/cs50/libcs50-java \ 69 | --vendor CS50 \ 70 | --version $(VERSION) \ 71 | . 72 | 73 | rm -rf build/rpm/libcs50-java 74 | 75 | .PHONY: docs 76 | docs: 77 | rm -rf docs 78 | javadoc -d docs -linkoffline https://docs.oracle.com/javase/8/docs/api/ \ 79 | https://docs.oracle.com/javase/8/docs/api/ -sourcepath src edu.harvard 80 | 81 | .PHONY: install 82 | install: build 83 | mkdir -p $(DESTDIR) 84 | cp -r build/jar/cs50.jar $(DESTDIR) 85 | 86 | .PHONY: version 87 | version: 88 | @echo $(VERSION) 89 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CS50 Library for Java 2 | 3 | ## Documentation 4 | 5 | http://cs50.github.io/libcs50-java/edu/harvard/CS50.html 6 | 7 | ## Development 8 | 9 | ``` 10 | make build # builds class 11 | make jar # builds jar 12 | make docs # builds documentation 13 | make deb # builds deb package 14 | ``` 15 | 16 | ## Installation 17 | 18 | ### Ubuntu 19 | 20 | ``` 21 | $ curl -s https://packagecloud.io/install/repositories/cs50/repo/script.deb.sh | sudo bash 22 | $ sudo apt-get install libcs50-java 23 | ``` 24 | 25 | ### Fedora 26 | 27 | ``` 28 | $ curl -s https://packagecloud.io/install/repositories/cs50/repo/script.rpm.sh | sudo bash 29 | $ sudo yum install libcs50-java 30 | ``` 31 | 32 | ### From Source 33 | 34 | 1. Download the latest release from https://github.com/cs50/libcs50-java/releases 35 | 1. Extract `libcs50-java*` 36 | 1. cd `libcs50-java*` 37 | 1. `make install # may require sudo` 38 | 39 | By default, we install to `/usr/local/share/java`. If you'd like to change the installation location, run `DESTDIR=/path/to/install make install` as desired. 40 | 41 | 42 | ## Usage 43 | 44 | // assuming cs50.jar is in $CLASSPATH 45 | import edu.harvard.CS50; 46 | 47 | ... 48 | 49 | char c = CS50.getChar(); 50 | double d = CS50.getDouble(); 51 | float f = CS50.getFloat(); 52 | int i = CS50.getInt(); 53 | long l = CS50.getLong(); 54 | String s = CS50.getString(); 55 | 56 | ## TODO 57 | 58 | * Decide if keeping `CS50.eprintf`. 59 | * Add tests. 60 | -------------------------------------------------------------------------------- /src/edu/harvard/CS50.java: -------------------------------------------------------------------------------- 1 | /** 2 | * CS50 Library for Java 3 | * https://github.com/cs50/lib50-java 4 | * 5 | * Port of CS50 Library to Java from C. 6 | * 7 | * Copyright (c) 2022, 8 | * David J. Malan 9 | * Kareem Zidane 10 | * All rights reserved. 11 | * 12 | * BSD 3-Clause License 13 | * http://www.opensource.org/licenses/BSD-3-Clause 14 | * 15 | * Redistribution and use in source and binary forms, with or without 16 | * modification, are permitted provided that the following conditions are 17 | * met: 18 | * 19 | * * Redistributions of source code must retain the above copyright notice, 20 | * this list of conditions and the following disclaimer. 21 | * * Redistributions in binary form must reproduce the above copyright 22 | * notice, this list of conditions and the following disclaimer in the 23 | * documentation and/or other materials provided with the distribution. 24 | * * Neither the name of CS50 nor the names of its contributors may be used 25 | * to endorse or promote products derived from this software without 26 | * specific prior written permission. 27 | * 28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 29 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 31 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 | * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 34 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 35 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 36 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 37 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 38 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 | */ 40 | 41 | package edu.harvard; 42 | 43 | import java.io.BufferedOutputStream; 44 | import java.io.FileDescriptor; 45 | import java.io.FileOutputStream; 46 | import java.io.PrintStream; 47 | import java.util.Scanner; 48 | 49 | public class CS50 50 | { 51 | // disable buffering on stderr and stdout, but only if class is initialized (i.e., actually used), per 52 | // http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4.1 53 | static 54 | { 55 | System.setErr(new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.err), 1))); 56 | System.setOut(new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.out), 1))); 57 | } 58 | 59 | /** 60 | * Singleton to avoid buffering of standard input. 61 | * 62 | * @see http://stackoverflow.com/a/4232614/1797347 63 | */ 64 | private final static Scanner scanner = new Scanner(System.in); 65 | 66 | /** 67 | * Prevents instantiation of class (since all methods are static). 68 | */ 69 | private CS50() 70 | {} 71 | 72 | /** 73 | * Prints an error message, formatted like {@link java.io.PrintStream#printf}, 74 | * to standard error, prefixing it with program's name as well as the file and 75 | * line number from which method was called. 76 | * 77 | * @param format A format string as described in 78 | * Format string syntax 79 | * 80 | * @param args Arguments referenced by the format specifiers in the format 81 | * string. If there are more arguments than format specifiers, the 82 | * extra arguments are ignored. The number of arguments is variable 83 | * and may be zero. The maximum number of arguments is limited by 84 | * the maximum dimension of a Java array as defined by 85 | * The Java™ Virtual Machine Specification. The 86 | * behaviour on a null argument depends on the 87 | * conversion. 88 | */ 89 | public static void eprintf(String format, Object... args) 90 | { 91 | StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace(); 92 | System.err.print(stackTrace[2].getFileName() + ":" + stackTrace[2].getLineNumber() + ": "); 93 | System.err.printf(format, args); 94 | } 95 | 96 | /** 97 | * Reads a line of text from standard input and returns the equivalent 98 | * {@code char}; if text does not represent a {@code char}, user is prompted 99 | * to retry. If line can't be read, returns {@link Character#MAX_VALUE}. 100 | * 101 | * @param prompt A string that prompts the user to provide input. 102 | * @return char 103 | */ 104 | public static char getChar(String prompt) 105 | { 106 | // try to get a char from user 107 | while (true) 108 | { 109 | // get a line of text, returning {@link Character#MAX_VALUE} on error 110 | String s = CS50.getString(prompt); 111 | if (s == null) 112 | { 113 | return Character.MAX_VALUE; 114 | } 115 | 116 | // return a char if only a char was provided 117 | if (s.length() == 1) 118 | { 119 | return s.charAt(0); 120 | } 121 | } 122 | } 123 | 124 | /** 125 | * Reads a line of text from standard input and returns the equivalent 126 | * {@code double} as precisely as possible; if text does not represent a 127 | * {@code double} or if value would cause underflow or overflow, user is 128 | * prompted to retry. If line can't be read, returns {@link Double#MAX_VALUE}. 129 | * 130 | * @param prompt A string that prompts the user to provide input. 131 | * @return double 132 | */ 133 | public static double getDouble(String prompt) 134 | { 135 | // try to get a double from user 136 | while (true) 137 | { 138 | // get a line of text, returning {@link Double#MAX_VALUE} on error 139 | String s = CS50.getString(prompt); 140 | if (s == null) 141 | { 142 | return Double.MAX_VALUE; 143 | } 144 | 145 | // return a {@code double} if only a {@code double} was provided 146 | if (s.matches("(\\+|-)?\\d*(\\.\\d*)?")) 147 | { 148 | try 149 | { 150 | double d = Double.parseDouble(s); 151 | if (!Double.isInfinite(d) && d < Double.MAX_VALUE) 152 | { 153 | return d; 154 | } 155 | } 156 | catch (Exception e) 157 | {} 158 | } 159 | } 160 | } 161 | 162 | /** 163 | * Reads a line of text from standard input and returns the equivalent 164 | * {@code float} as precisely as possible; if text does not represent a 165 | * {@code float} or if value would cause underflow or overflow, user is 166 | * prompted to retry. If line can't be read, returns {@link Float#MAX_VALUE}. 167 | * 168 | * @param prompt A string that prompts the user to provide input. 169 | * @return float 170 | */ 171 | public static float getFloat(String prompt) 172 | { 173 | // try to get a float from user 174 | while (true) 175 | { 176 | // get a line of text, returning {@link Float#MAX_VALUE} on error 177 | String s = CS50.getString(prompt); 178 | if (s == null) 179 | { 180 | return Float.MAX_VALUE; 181 | } 182 | 183 | // return a {@code float} if only a {@code float} was provided 184 | if (s.matches("(\\+|-)?\\d*(\\.\\d*)?")) 185 | { 186 | try 187 | { 188 | float f = Float.parseFloat(s); 189 | if (!Float.isInfinite(f) && f < Float.MAX_VALUE) 190 | { 191 | return f; 192 | } 193 | } 194 | catch (Exception e) 195 | {} 196 | } 197 | } 198 | } 199 | 200 | /** 201 | * Reads a line of text from standard input and returns it as an 202 | * {@code int} in [-231, 231 - 1) if possible; 203 | * if text does not represent such an {@code int} or if value would 204 | * cause underflow or overflow, user is prompted to retry. If line 205 | * can't be read, returns {@link Integer#MAX_VALUE}. 206 | * 207 | * @param prompt A string that prompts the user to provide input. 208 | * @return int 209 | */ 210 | public static int getInt(String prompt) 211 | { 212 | // try to get an int from user 213 | while (true) 214 | { 215 | // get a line of text, returning {@link Integer.MAX_VALUE} on error 216 | String s = CS50.getString(prompt); 217 | if (s == null) 218 | { 219 | return Integer.MAX_VALUE; 220 | } 221 | 222 | // return an {@code int} if only an {@code int} was provided 223 | if (s.matches("(\\+|-)?\\d+")) 224 | { 225 | try 226 | { 227 | return Integer.parseInt(s); 228 | } 229 | catch (Exception e) 230 | {} 231 | } 232 | } 233 | } 234 | 235 | /** 236 | * Reads a line of text from standard input and returns an equivalent 237 | * {@code long} in [-263, 263 - 1) if possible; 238 | * if text does not represent such a {@code long} or if value would 239 | * cause underflow or overflow, user is prompted to retry. If line 240 | * can't be read, returns {@link Long#MAX_VALUE}. 241 | * 242 | * @param prompt A string that prompts the user to provide input. 243 | * @return long 244 | */ 245 | public static long getLong(String prompt) 246 | { 247 | // try to get a long from user 248 | while (true) 249 | { 250 | // get a line of text, returning {@link Long.MAX_VALUE} on error 251 | String s = CS50.getString(prompt); 252 | if (s == null) 253 | { 254 | return Long.MAX_VALUE; 255 | } 256 | 257 | // return a {@code long} if only a {@code long} was provided 258 | if (s.matches("(\\+|-)?\\d+")) 259 | { 260 | try 261 | { 262 | return Long.parseLong(s); 263 | } 264 | catch (Exception e) 265 | {} 266 | } 267 | } 268 | } 269 | 270 | /** 271 | * Reads a line of text from standard input and returns it as a 272 | * {@link String}, sans trailing line ending. Supports CR ({@code \r}), 273 | * LF ({@code \n}), and CRLF ({@code \r\n}) as line endings. Returns "" 274 | * if user inputs only CR, LF, or CRLF. Returns "" upon no input 275 | * whatsoever (i.e., EOF). Returns {@code null} upon error. 276 | * 277 | * @param prompt A string that prompts the user to provide input. 278 | * @return String 279 | */ 280 | public static String getString(String prompt) 281 | { 282 | // try to get a String from user, returning null on error 283 | System.out.print(prompt); 284 | try 285 | { 286 | return CS50.scanner.nextLine(); 287 | } 288 | catch (Exception e) 289 | { 290 | return null; 291 | } 292 | } 293 | } 294 | -------------------------------------------------------------------------------- /test/linux.txt: -------------------------------------------------------------------------------- 1 | foo 2 | bar 3 | baz -------------------------------------------------------------------------------- /test/mac.txt: -------------------------------------------------------------------------------- 1 | foo bar baz -------------------------------------------------------------------------------- /test/windows.txt: -------------------------------------------------------------------------------- 1 | foo 2 | bar 3 | baz --------------------------------------------------------------------------------