commit 7e7a7bfbcf65672ede40e874a8aa293969dec35e
Author: Wim Dupont <wim@wimdupont.com>
Date: Thu, 19 Dec 2024 14:50:41 +0100
init
Diffstat:
| A | .gitignore | | | 2 | ++ |
| A | LICENSE | | | 675 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Makefile | | | 40 | ++++++++++++++++++++++++++++++++++++++++ |
| A | README.adoc | | | 13 | +++++++++++++ |
| A | config.h | | | 9 | +++++++++ |
| A | cpc.1 | | | 18 | ++++++++++++++++++ |
| A | cpc.c | | | 235 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
7 files changed, 992 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+*.o
+cpc
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,675 @@
+
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ cpc
+ Copyright (C) 2024 Wim Dupont
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ cpc Copyright (C) 2024 Wim Dupont
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,40 @@
+CC = gcc -g
+
+NAME = cpc
+VERSION = 0.1
+
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+BIN = cpc
+SRC = cpc.c
+OBJ = ${SRC:.c=.o}
+MAN1 = ${BIN:=.1}
+
+all: ${BIN}
+
+LDFLAGS=-lcjson -lcurl
+
+.c.o:
+ $(CC) -g -c $(CFLAGS) $<
+
+cex: cpc.o
+ ${CC} -g -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+ rm -f ${BIN} ${OBJ}
+
+install: all
+ mkdir -p ${DESTDIR}${PREFIX}/bin
+ cp -f ${BIN} "${DESTDIR}${PREFIX}/bin"
+ chmod 755 "${DESTDIR}${PREFIX}/bin/${BIN}"
+ mkdir -p "${DESTDIR}${MANPREFIX}/man1"
+ sed "s/VERSION/${VERSION}/g" < ${MAN1} > "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+ chmod 644 "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+
+uninstall:
+ rm -f \
+ "${DESTDIR}${PREFIX}/bin/${BIN}"\
+ "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+
+.PHONY: all clean install uninstall
diff --git a/README.adoc b/README.adoc
@@ -0,0 +1,13 @@
+= CPC
+
+Cryptocurrency Price Checker.
+
+Retrieves current prices of currencies configured in the config.h file and persists them in file. Can be used to
+just check up on prices and to convert fiat to crypto values or visa versa.
+
+== Installation
+
+[source,bash]
+----
+$ make clean install
+----
diff --git a/config.h b/config.h
@@ -0,0 +1,9 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#define FIAT "usd"
+#define CURRENCIES "bitcoin,monero"
+#define URL "https://api.coingecko.com/api/v3/coins/markets?ids=%s&vs_currency=%s"
+#define PRICES_FILE "$HOME/.config/scripts/prices"
+
+#endif
diff --git a/cpc.1 b/cpc.1
@@ -0,0 +1,18 @@
+.TH CPC 1 cpc-VERSION
+.SH NAME
+cpc
+.SH SYNOPSIS
+.B cpc
+.SH DESCRIPTION
+.B cpc
+is a cryptocurrency price checker and converter.
+.SH OPTIONS
+.TP
+.BI \-u
+updates the prices file by calling API.
+.TP
+.BI \-r
+reverts the order of conversion to chosen value as fiat.
+.TP
+.BI \-v " value"
+defines the amount of the currency to be checked. Default this is 1.
diff --git a/cpc.c b/cpc.c
@@ -0,0 +1,235 @@
+#include <stdio.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <cjson/cJSON.h>
+#include <curl/curl.h>
+
+#include "config.h"
+
+#define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
+
+typedef enum {AS_FIAT, AS_CRYPTO} Action;
+
+typedef struct
+{
+ char *response;
+ size_t size;
+} Memory;
+
+static size_t writefunc(char *data, size_t size, size_t nmemb, Memory *mem);
+static void parse_array(cJSON *array);
+static void parse_json_object(const char *json_string);
+static char * replace_home(char *buf, const char *path);
+static void do_action(Action action, const double value);
+static void call_api();
+static char * cpstr(char *dest, const char *src);
+static void fatal(const char *fmt, ...);
+
+static char file[PATH_MAX];
+
+int
+main(int argc, char **argv)
+{
+ int opt, update = 0;
+ double value = 1;
+ Action action = AS_CRYPTO;
+
+ replace_home(file, PRICES_FILE);
+
+ while ((opt = getopt(argc, argv, "urv:")) != -1) {
+ switch (opt) {
+ case 'u':
+ update = 1;
+ break;
+ case 'r':
+ action = AS_FIAT;
+ break;
+ case 'v':
+ sscanf(optarg, "%lf", &value);
+ break;
+ default:
+ fatal("Unknown option: %c\n", optopt);
+ break;
+ }
+ }
+
+ for(; optind < argc; optind++)
+ printf("ignored arguments: %s\n", argv[optind]);
+
+ if (update)
+ call_api();
+
+ do_action(action, value);
+}
+
+size_t
+writefunc(char *data, size_t size, size_t nmemb, Memory *mem)
+{
+ size_t realsize = size * nmemb;
+
+ char *ptr = realloc(mem->response, mem->size + realsize + 1);
+ if (!ptr)
+ fatal("Realloc failed\n");
+
+ mem->response = ptr;
+ memcpy(&(mem->response[mem->size]), data, realsize);
+ mem->size += realsize;
+ mem->response[mem->size] = 0;
+
+ return realsize;
+}
+
+void
+parse_array(cJSON *array)
+{
+ cJSON *item = array ? array->child : 0;
+ FILE *fp = fopen(file, "w+");
+
+ if (!fp)
+ fatal("opening file failed\n");
+
+ while (item) {
+ cJSON *name = cJSON_GetObjectItem(item, "name");
+ cJSON *price = cJSON_GetObjectItem(item, "current_price");
+ fprintf(fp, "%s;%f\n", name->valuestring, price->valuedouble);
+ item=item->next;
+ }
+
+ fclose(fp);
+}
+
+void
+parse_json_object(const char *json_string)
+{
+ cJSON *json = cJSON_Parse(json_string);
+ if (json == NULL) {
+ const char *error_ptr = cJSON_GetErrorPtr();
+ if (error_ptr != NULL)
+ fprintf(stderr, "Error before: %s\n", error_ptr);
+ return;
+ }
+ parse_array(json);
+ cJSON_Delete(json);
+}
+
+char *
+replace_home(char *buf, const char *path)
+{
+ char *envv = "$HOME";
+ struct passwd userinf;
+ char *userhome;
+
+ userinf = *getpwuid(getuid());
+ userhome = strdup(userinf.pw_dir);
+
+ if ((strstr(path, envv) != NULL)) {
+ cpstr(buf, userhome);
+ strcat(buf, path + strlen(envv));
+ } else
+ cpstr(buf, path);
+
+ free(userhome);
+
+ return buf;
+}
+
+void
+do_action(Action action, const double value)
+{
+ char *line_buf = NULL;
+ size_t line_buf_size = 0;
+ ssize_t line_size;
+ char name[50];
+ double price;
+
+ FILE *fp = fopen(file, "r");
+
+ if (!fp)
+ fatal("Error opening file '%s'\n", file);
+
+ while ((getline(&line_buf, &line_buf_size, fp)) >= 0) {
+ sscanf(line_buf, "%[^;];%lf", name, &price);
+ switch (action) {
+ case AS_FIAT:
+ printf("%f %s\n", value/price, name);
+ break;
+ case AS_CRYPTO:
+ printf("(%s) %f %s\n", name, value*price, FIAT);
+ break;
+ default:
+ break;
+ }
+ }
+
+ free(line_buf);
+
+ fclose(fp);
+}
+
+void
+call_api()
+{
+ char request[strlen(URL) + strlen(FIAT) + strlen(CURRENCIES) + 1];
+ char libversion[20];
+ struct curl_slist *headers = NULL;
+ Memory mem = {0};
+
+ headers = curl_slist_append(headers, "Content-Type: application/json");
+ headers = curl_slist_append(headers, "charset: utf-8");
+ CURL *curl = curl_easy_init();
+
+ curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
+ sprintf(libversion, "curl/%u.%u.%u",
+ (ver->version_num >> 16) & 0xff,
+ (ver->version_num >> 8) & 0xff,
+ ver->version_num & 0xff);
+ sprintf(request, URL, CURRENCIES, FIAT);
+
+ if (curl) {
+ CURLcode res;
+ curl_easy_setopt(curl, CURLOPT_URL, request);
+ curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "");
+ curl_easy_setopt(curl, CURLOPT_USERAGENT, libversion);
+ curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writefunc);
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, &mem);
+ curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
+
+ res = curl_easy_perform(curl);
+
+ if (res != CURLE_OK)
+ fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+
+ parse_json_object(mem.response);
+ free(mem.response);
+
+ curl_slist_free_all(headers);
+ curl_easy_cleanup(curl);
+ }
+ printf("\n=== Updated prices ===\n");
+}
+
+char *
+cpstr(char *dest, const char *src)
+{
+ size_t cplen = strlen(src);
+ memcpy(dest, src, cplen);
+ dest[cplen] = '\0';
+ return dest;
+}
+
+void
+fatal(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+
+ //clean();
+
+ exit(EXIT_FAILURE);
+}
