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Message-ID: <20240809153423.30829-3-contact@hacktivis.me>
Date: Fri, 9 Aug 2024 17:34:23 +0200
From: contact@...ktivis.me
To: musl@...ts.openwall.com
Cc: "Haelwenn (lanodan) Monnier" <contact@...ktivis.me>
Subject: [PATCH v3 3/3] signal: add str2sig(3) from POSIX.1-2024
From: "Haelwenn (lanodan) Monnier" <contact@...ktivis.me>
---
include/signal.h | 1 +
src/signal/str2sig.c | 54 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+)
create mode 100644 src/signal/str2sig.c
diff --git a/include/signal.h b/include/signal.h
index 94ac29b1..5451424d 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -237,6 +237,7 @@ void psignal(int, const char *);
// Bumped to 13 to be safe if a case like "SIGRTMIN+nnn" happens
#define SIG2STR_MAX 13
int sig2str(int signum, char *str);
+int str2sig(const char *__restrict str, int *__restrict pnum);
#endif
diff --git a/src/signal/str2sig.c b/src/signal/str2sig.c
new file mode 100644
index 00000000..e4c17c57
--- /dev/null
+++ b/src/signal/str2sig.c
@@ -0,0 +1,54 @@
+#include <signal.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+int str2sig(const char *restrict str, int *restrict pnum)
+{
+ if (str[0] == '\0') return -1;
+
+ errno = 0;
+ long signum = strtol(str, NULL, 10);
+ if (errno == 0 && signum < _NSIG) return (*pnum = signum, 0);
+
+ if (strnlen(str, sizeof *__sys_signame) <= sizeof *__sys_signame)
+ for (int i = 0; i < sizeof __sys_signame/sizeof *__sys_signame; i++)
+ if (strncmp(str, __sys_signame[i], sizeof *__sys_signame) == 0)
+ return (*pnum = i, 0);
+
+ // signal aliases
+ if (strcmp(str, "IOT") == 0)
+ return (*pnum = SIGIOT, 0);
+ if (strcmp(str, "UNUSED") == 0)
+ return (*pnum = SIGUNUSED, 0);
+#if SIGPOLL == SIGIO
+ if (strcmp(str, "POLL") == 0)
+ return (*pnum = SIGPOLL, 0);
+#endif
+
+ if (strcmp(str, "RTMIN") == 0)
+ return (*pnum = SIGRTMIN, 0);
+ if (strcmp(str, "RTMAX") == 0)
+ return (*pnum = SIGRTMAX, 0);
+
+ if (strncmp(str, "RTMIN+", 6) == 0 || strncmp(str, "RTMAX-", 6) == 0)
+ {
+ if(!isdigit(str[6])) return -1;
+
+ int sigrt = str[6]-'0';
+
+ if(str[7] != '\0')
+ {
+ if(!isdigit(str[7])) return -1;
+
+ sigrt *= 10;
+ sigrt += str[7]-'0';
+ }
+
+ *pnum = str[5] == '+' ? SIGRTMIN + sigrt : SIGRTMAX - sigrt;
+ return 0;
+ }
+
+ return -1;
+}
--
2.44.2
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